55917507 has 4 divisors (see below), whose sum is σ = 74556680. Its totient is φ = 37278336.

The previous prime is 55917503. The next prime is 55917517. The reversal of 55917507 is 70571955.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55917507 - 2² = 55917503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55917503) 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, 9319582 + ... + 9319587.

It is an arithmetic number, because the mean of its divisors is an integer number (18639170).

Almost surely, 2^55917507 is an apocalyptic number.

55917507 is a deficient number, since it is larger than the sum of its proper divisors (18639173).

55917507 is a wasteful number, since it uses less digits than its factorization.

55917507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18639172.

The product of its (nonzero) digits is 55125, while the sum is 39.

The square root of 55917507 is about 7477.8009468025. The cubic root of 55917507 is about 382.3982830048.

The spelling of 55917507 in words is "fifty-five million, nine hundred seventeen thousand, five hundred seven".