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1081661413 = 71271216717
BaseRepresentation
bin100000001111000…
…1101011111100101
32210101100002111211
41000132031133211
54203401131123
6255155431421
735542653550
oct10036153745
92711302454
101081661413
1150562a258
122622b5571
1314312c851
14a3927697
1564e6240d
hex4078d7e5

1081661413 has 8 divisors (see below), whose sum is σ = 1245919232. Its totient is φ = 919837296.

The previous prime is 1081661387. The next prime is 1081661423. The reversal of 1081661413 is 3141661801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1081661413 - 25 = 1081661381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081661423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607470 + ... + 609247.

It is an arithmetic number, because the mean of its divisors is an integer number (155739904).

Almost surely, 21081661413 is an apocalyptic number.

It is an amenable number.

1081661413 is a deficient number, since it is larger than the sum of its proper divisors (164257819).

1081661413 is a wasteful number, since it uses less digits than its factorization.

1081661413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216851.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1081661413 is about 32888.6213301804. The cubic root of 1081661413 is about 1026.5114051746.

It can be divided in two parts, 108 and 1661413, that added together give a square (1661521 = 12892).

The spelling of 1081661413 in words is "one billion, eighty-one million, six hundred sixty-one thousand, four hundred thirteen".

Divisors: 1 7 127 889 1216717 8517019 154523059 1081661413