51939291 has 16 divisors (see below), whose sum is σ = 71687168. Its totient is φ = 33415200.

The previous prime is 51939287. The next prime is 51939299. The reversal of 51939291 is 19293915.

It is not a de Polignac number, because 51939291 - 2² = 51939287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51939299) 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, 50361 + ... + 51381.

It is an arithmetic number, because the mean of its divisors is an integer number (4480448).

Almost surely, 2^51939291 is an apocalyptic number.

51939291 is a deficient number, since it is larger than the sum of its proper divisors (19747877).

51939291 is a wasteful number, since it uses less digits than its factorization.

51939291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602.

The product of its digits is 21870, while the sum is 39.

The square root of 51939291 is about 7206.8919098319. The cubic root of 51939291 is about 373.1058046179.

The spelling of 51939291 in words is "fifty-one million, nine hundred thirty-nine thousand, two hundred ninety-one".