55916517 has 4 divisors (see below), whose sum is σ = 74555360. Its totient is φ = 37277676.

The previous prime is 55916513. The next prime is 55916521. The reversal of 55916517 is 71561955.

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 an interprime number because it is at equal distance from previous prime (55916513) and next prime (55916521).

It is not a de Polignac number, because 55916517 - 2² = 55916513 is a prime.

It is a super-2 number, since 2×55916517² = 6253313746822578, 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 (55916513) 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, 9319417 + ... + 9319422.

It is an arithmetic number, because the mean of its divisors is an integer number (18638840).

Almost surely, 2^55916517 is an apocalyptic number.

It is an amenable number.

55916517 is a deficient number, since it is larger than the sum of its proper divisors (18638843).

55916517 is a wasteful number, since it uses less digits than its factorization.

55916517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18638842.

The product of its digits is 47250, while the sum is 39.

The square root of 55916517 is about 7477.7347505779. The cubic root of 55916517 is about 382.3960262487.

The spelling of 55916517 in words is "fifty-five million, nine hundred sixteen thousand, five hundred seventeen".