55717251 has 4 divisors (see below), whose sum is σ = 74289672. Its totient is φ = 37144832.

The previous prime is 55717243. The next prime is 55717271. The reversal of 55717251 is 15271755.

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

It is a cyclic number.

It is not a de Polignac number, because 55717251 - 2³ = 55717243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55717241) 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, 9286206 + ... + 9286211.

It is an arithmetic number, because the mean of its divisors is an integer number (18572418).

Almost surely, 2^55717251 is an apocalyptic number.

55717251 is a deficient number, since it is larger than the sum of its proper divisors (18572421).

55717251 is a wasteful number, since it uses less digits than its factorization.

55717251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18572420.

The product of its digits is 12250, while the sum is 33.

The square root of 55717251 is about 7464.3989041315. The cubic root of 55717251 is about 381.9412457721.

The spelling of 55717251 in words is "fifty-five million, seven hundred seventeen thousand, two hundred fifty-one".