55917251 has 4 divisors (see below), whose sum is σ = 60218592. Its totient is φ = 51615912.

The previous prime is 55917241. The next prime is 55917269. The reversal of 55917251 is 15271955.

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 55917251 - 2¹⁰ = 55916227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55917241) 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, 2150651 + ... + 2150676.

It is an arithmetic number, because the mean of its divisors is an integer number (15054648).

Almost surely, 2^55917251 is an apocalyptic number.

55917251 is a deficient number, since it is larger than the sum of its proper divisors (4301341).

55917251 is a wasteful number, since it uses less digits than its factorization.

55917251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4301340.

The product of its digits is 15750, while the sum is 35.

The square root of 55917251 is about 7477.7838294511. The cubic root of 55917251 is about 382.3976994421.

The spelling of 55917251 in words is "fifty-five million, nine hundred seventeen thousand, two hundred fifty-one".