51493239 has 40 divisors (see below), whose sum is σ = 88548768. Its totient is φ = 29211840.

The previous prime is 51493237. The next prime is 51493243. The reversal of 51493239 is 93239415.

It is a happy number.

It is not a de Polignac number, because 51493239 - 2¹ = 51493237 is a prime.

It is a super-2 number, since 2×51493239² = 5303107325422242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51493237) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 111469 + ... + 111929.

Almost surely, 2^51493239 is an apocalyptic number.

51493239 is a deficient number, since it is larger than the sum of its proper divisors (37055529).

51493239 is a wasteful number, since it uses less digits than its factorization.

51493239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 668 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 51493239 is about 7175.8789705513. The cubic root of 51493239 is about 372.0346611824.

The spelling of 51493239 in words is "fifty-one million, four hundred ninety-three thousand, two hundred thirty-nine".