51500553 has 24 divisors (see below), whose sum is σ = 74945088. Its totient is φ = 31442112.

The previous prime is 51500539. The next prime is 51500557. The reversal of 51500553 is 35500515.

It is not a de Polignac number, because 51500553 - 2¹² = 51496457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51500557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79276 + ... + 79922.

It is an arithmetic number, because the mean of its divisors is an integer number (3122712).

Almost surely, 2^51500553 is an apocalyptic number.

It is an amenable number.

51500553 is a deficient number, since it is larger than the sum of its proper divisors (23444535).

51500553 is a wasteful number, since it uses less digits than its factorization.

51500553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 1875, while the sum is 24.

The square root of 51500553 is about 7176.3885764359. The cubic root of 51500553 is about 372.0522747096.

The spelling of 51500553 in words is "fifty-one million, five hundred thousand, five hundred fifty-three".