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55321993 = 377121059
BaseRepresentation
bin1101001100001…
…0010110001001
310212002122111201
43103002112021
5103130300433
65253424201
71241141416
oct323022611
9125078451
1055321993
1129256261
121663b061
13b5cc90c
1474c110d
154ccba7d
hex34c2589

55321993 has 8 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 53066160.

The previous prime is 55321991. The next prime is 55322009. The reversal of 55321993 is 39912355.

It is the 3037-th star number.

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

It is a cyclic number.

It is not a de Polignac number, because 55321993 - 21 = 55321991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55321991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7903 + ... + 13156.

It is an arithmetic number, because the mean of its divisors is an integer number (7202520).

Almost surely, 255321993 is an apocalyptic number.

It is an amenable number.

55321993 is a deficient number, since it is larger than the sum of its proper divisors (2298167).

55321993 is a wasteful number, since it uses less digits than its factorization.

55321993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21167.

The product of its digits is 36450, while the sum is 37.

The square root of 55321993 is about 7437.8755703494. The cubic root of 55321993 is about 381.0359383115.

The spelling of 55321993 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred ninety-three".

Divisors: 1 37 71 2627 21059 779183 1495189 55321993