51236857 has 4 divisors (see below), whose sum is σ = 58556416. Its totient is φ = 43917300.

The previous prime is 51236833. The next prime is 51236869. The reversal of 51236857 is 75863215.

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.

It is not a de Polignac number, because 51236857 - 2¹⁵ = 51204089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51236807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3659769 + ... + 3659782.

It is an arithmetic number, because the mean of its divisors is an integer number (14639104).

Almost surely, 2^51236857 is an apocalyptic number.

It is an amenable number.

51236857 is a deficient number, since it is larger than the sum of its proper divisors (7319559).

51236857 is an equidigital number, since it uses as much as digits as its factorization.

51236857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319558.

The product of its digits is 50400, while the sum is 37.

The square root of 51236857 is about 7157.9925258413. The cubic root of 51236857 is about 371.4161869004.

The spelling of 51236857 in words is "fifty-one million, two hundred thirty-six thousand, eight hundred fifty-seven".