51239907 has 12 divisors (see below), whose sum is σ = 75268440. Its totient is φ = 33580608.

The previous prime is 51239863. The next prime is 51239911. The reversal of 51239907 is 70993215.

It is not a de Polignac number, because 51239907 - 2⁶ = 51239843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51239957) 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, 47718 + ... + 48779.

It is an arithmetic number, because the mean of its divisors is an integer number (6272370).

Almost surely, 2^51239907 is an apocalyptic number.

51239907 is a deficient number, since it is larger than the sum of its proper divisors (24028533).

51239907 is a wasteful number, since it uses less digits than its factorization.

51239907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96562 (or 96559 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 51239907 is about 7158.2055712308. The cubic root of 51239907 is about 371.4235565750.

The spelling of 51239907 in words is "fifty-one million, two hundred thirty-nine thousand, nine hundred seven".