51137121 has 16 divisors (see below), whose sum is σ = 80611200. Its totient is φ = 28213248.

The previous prime is 51137117. The next prime is 51137143. The reversal of 51137121 is 12173115.

It is a happy number.

It is not a de Polignac number, because 51137121 - 2² = 51137117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51137161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41376 + ... + 42593.

It is an arithmetic number, because the mean of its divisors is an integer number (5038200).

Almost surely, 2^51137121 is an apocalyptic number.

It is an amenable number.

51137121 is a deficient number, since it is larger than the sum of its proper divisors (29474079).

51137121 is a wasteful number, since it uses less digits than its factorization.

51137121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84008.

The product of its digits is 210, while the sum is 21.

The square root of 51137121 is about 7151.0223744581. The cubic root of 51137121 is about 371.1750348018.

The spelling of 51137121 in words is "fifty-one million, one hundred thirty-seven thousand, one hundred twenty-one".