51253215 has 32 divisors (see below), whose sum is σ = 93514176. Its totient is φ = 23746560.

The previous prime is 51253201. The next prime is 51253219. The reversal of 51253215 is 51235215.

51253215 = 603² + 604² + ... + 719².

It is a happy number.

It is not a de Polignac number, because 51253215 - 2⁵ = 51253183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51253219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4416 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (2922318).

Almost surely, 2^51253215 is an apocalyptic number.

51253215 is a deficient number, since it is larger than the sum of its proper divisors (42260961).

51253215 is a wasteful number, since it uses less digits than its factorization.

51253215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15499.

The product of its digits is 1500, while the sum is 24.

The square root of 51253215 is about 7159.1350734568. The cubic root of 51253215 is about 371.4557090978.

The spelling of 51253215 in words is "fifty-one million, two hundred fifty-three thousand, two hundred fifteen".