55907919 has 12 divisors (see below), whose sum is σ = 81347136. Its totient is φ = 36999072.

The previous prime is 55907909. The next prime is 55907921. The reversal of 55907919 is 91970955.

55907919 is a `hidden beast` number, since 559 + 0 + 7 + 91 + 9 = 666.

It is not a de Polignac number, because 55907919 - 2⁷ = 55907791 is a prime.

It is a super-2 number, since 2×55907919² = 6251390813821122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55907909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21439 + ... + 23904.

It is an arithmetic number, because the mean of its divisors is an integer number (6778928).

Almost surely, 2^55907919 is an apocalyptic number.

55907919 is a deficient number, since it is larger than the sum of its proper divisors (25439217).

55907919 is a wasteful number, since it uses less digits than its factorization.

55907919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45486 (or 45483 counting only the distinct ones).

The product of its (nonzero) digits is 127575, while the sum is 45.

The square root of 55907919 is about 7477.1598217505. The cubic root of 55907919 is about 382.3764255430.

The spelling of 55907919 in words is "fifty-five million, nine hundred seven thousand, nine hundred nineteen".