51152557 has 4 divisors (see below), whose sum is σ = 51916096. Its totient is φ = 50389020.

The previous prime is 51152551. The next prime is 51152567. The reversal of 51152557 is 75525115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75525115 = 5 ⋅15105023.

It is a cyclic number.

It is not a de Polignac number, because 51152557 - 2¹⁹ = 50628269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51152551) 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, 381669 + ... + 381802.

It is an arithmetic number, because the mean of its divisors is an integer number (12979024).

Almost surely, 2^51152557 is an apocalyptic number.

It is an amenable number.

51152557 is a deficient number, since it is larger than the sum of its proper divisors (763539).

51152557 is an equidigital number, since it uses as much as digits as its factorization.

51152557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763538.

The product of its digits is 8750, while the sum is 31.

The square root of 51152557 is about 7152.1015792563. The cubic root of 51152557 is about 371.2123780685.

It can be divided in two parts, 5115 and 2557, that multiplied together give a triangular number (13079055 = T₅₁₁₄).

The spelling of 51152557 in words is "fifty-one million, one hundred fifty-two thousand, five hundred fifty-seven".