51244555 has 4 divisors (see below), whose sum is σ = 61493472. Its totient is φ = 40995640.

The previous prime is 51244549. The next prime is 51244561. The reversal of 51244555 is 55544215.

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

It is an interprime number because it is at equal distance from previous prime (51244549) and next prime (51244561).

It is not a de Polignac number, because 51244555 - 2⁹ = 51244043 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124451 + ... + 5124460.

It is an arithmetic number, because the mean of its divisors is an integer number (15373368).

Almost surely, 2^51244555 is an apocalyptic number.

51244555 is a deficient number, since it is larger than the sum of its proper divisors (10248917).

51244555 is a wasteful number, since it uses less digits than its factorization.

51244555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10248916.

The product of its digits is 20000, while the sum is 31.

The square root of 51244555 is about 7158.5302262406. The cubic root of 51244555 is about 371.4347869135.

The spelling of 51244555 in words is "fifty-one million, two hundred forty-four thousand, five hundred fifty-five".