55785117 has 4 divisors (see below), whose sum is σ = 74380160. Its totient is φ = 37190076.

The previous prime is 55785113. The next prime is 55785127. The reversal of 55785117 is 71158755.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55785117 - 2² = 55785113 is a prime.

It is a super-2 number, since 2×55785117² = 6223958557407378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55785113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9297517 + ... + 9297522.

It is an arithmetic number, because the mean of its divisors is an integer number (18595040).

Almost surely, 2^55785117 is an apocalyptic number.

It is an amenable number.

55785117 is a deficient number, since it is larger than the sum of its proper divisors (18595043).

55785117 is a wasteful number, since it uses less digits than its factorization.

55785117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18595042.

The product of its digits is 49000, while the sum is 39.

The square root of 55785117 is about 7468.9434995855. The cubic root of 55785117 is about 382.0962564556.

The spelling of 55785117 in words is "fifty-five million, seven hundred eighty-five thousand, one hundred seventeen".