51864907 has 4 divisors (see below), whose sum is σ = 51936976. Its totient is φ = 51792840.

The previous prime is 51864893. The next prime is 51864941. The reversal of 51864907 is 70946815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70946815 = 5 ⋅14189363.

It is a cyclic number.

It is not a de Polignac number, because 51864907 - 2⁷ = 51864779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51864907.

It is not an unprimeable number, because it can be changed into a prime (51864947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34944 + ... + 36397.

It is an arithmetic number, because the mean of its divisors is an integer number (12984244).

Almost surely, 2^51864907 is an apocalyptic number.

51864907 is a deficient number, since it is larger than the sum of its proper divisors (72069).

51864907 is an equidigital number, since it uses as much as digits as its factorization.

51864907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72068.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 51864907 is about 7201.7294450708. The cubic root of 51864907 is about 372.9276070793.

The spelling of 51864907 in words is "fifty-one million, eight hundred sixty-four thousand, nine hundred seven".