55551251 has 8 divisors (see below), whose sum is σ = 64783200. Its totient is φ = 47615064.

The previous prime is 55551247. The next prime is 55551259. The reversal of 55551251 is 15215555.

It is not a de Polignac number, because 55551251 - 2² = 55551247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55551259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80636 + ... + 81321.

It is an arithmetic number, because the mean of its divisors is an integer number (8097900).

Almost surely, 2^55551251 is an apocalyptic number.

55551251 is a deficient number, since it is larger than the sum of its proper divisors (9231949).

55551251 is an equidigital number, since it uses as much as digits as its factorization.

55551251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161978 (or 161964 counting only the distinct ones).

The product of its digits is 6250, while the sum is 29.

The square root of 55551251 is about 7453.2711610406. The cubic root of 55551251 is about 381.5615589578.

The spelling of 55551251 in words is "fifty-five million, five hundred fifty-one thousand, two hundred fifty-one".