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61381985 = 5717711453
BaseRepresentation
bin1110101000100…
…1110101100001
311021111112020212
43222021311201
5111203210420
610031343505
71343511140
oct352116541
9137445225
1061381985
1131715215
1218681b95
13c942002
14821b757
1555c73c5
hex3a89d61

61381985 has 32 divisors (see below), whose sum is σ = 90450432. Its totient is φ = 39029760.

The previous prime is 61381937. The next prime is 61381993. The reversal of 61381985 is 58918316.

61381985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61381985 - 28 = 61381729 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41519 + ... + 42971.

It is an arithmetic number, because the mean of its divisors is an integer number (2826576).

It is the magic constant of a 497 × 497 magic square.

Almost surely, 261381985 is an apocalyptic number.

It is an amenable number.

61381985 is a deficient number, since it is larger than the sum of its proper divisors (29068447).

61381985 is a wasteful number, since it uses less digits than its factorization.

61381985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553.

The product of its digits is 51840, while the sum is 41.

The square root of 61381985 is about 7834.6655959269. The cubic root of 61381985 is about 394.4696937410.

The spelling of 61381985 in words is "sixty-one million, three hundred eighty-one thousand, nine hundred eighty-five".

Divisors: 1 5 7 17 35 71 85 119 355 497 595 1207 1453 2485 6035 7265 8449 10171 24701 42245 50855 103163 123505 172907 515815 722141 864535 1753771 3610705 8768855 12276397 61381985