51323913 has 12 divisors (see below), whose sum is σ = 74216688. Its totient is φ = 34178040.

The previous prime is 51323903. The next prime is 51323917. The reversal of 51323913 is 31932315.

It is a happy number.

It is not a de Polignac number, because 51323913 - 2¹⁰ = 51322889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51323917) 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, 7206 + ... + 12432.

It is an arithmetic number, because the mean of its divisors is an integer number (6184724).

Almost surely, 2^51323913 is an apocalyptic number.

It is an amenable number.

51323913 is a deficient number, since it is larger than the sum of its proper divisors (22892775).

51323913 is a wasteful number, since it uses less digits than its factorization.

51323913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324 (or 6321 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 51323913 is about 7164.0709795479. The cubic root of 51323913 is about 371.6264243085.

It can be divided in two parts, 5132 and 3913, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 51323913 in words is "fifty-one million, three hundred twenty-three thousand, nine hundred thirteen".