51285393 has 12 divisors (see below), whose sum is σ = 76822928. Its totient is φ = 34190100.

The previous prime is 51285361. The next prime is 51285431. The reversal of 51285393 is 39358215.

51285393 is a `hidden beast` number, since 512 + 8 + 53 + 93 = 666.

It is not a de Polignac number, because 51285393 - 2⁵ = 51285361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51285343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105283 + ... + 105768.

Almost surely, 2^51285393 is an apocalyptic number.

It is an amenable number.

51285393 is a deficient number, since it is larger than the sum of its proper divisors (25537535).

51285393 is an equidigital number, since it uses as much as digits as its factorization.

51285393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211066 (or 211054 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 51285393 is about 7161.3820593514. The cubic root of 51285393 is about 371.5334291087.

It can be divided in two parts, 512 and 85393, that added together give a triangular number (85905 = T₄₁₄).

The spelling of 51285393 in words is "fifty-one million, two hundred eighty-five thousand, three hundred ninety-three".