51907951 has 4 divisors (see below), whose sum is σ = 52533432. Its totient is φ = 51282472.

The previous prime is 51907931. The next prime is 51907957. The reversal of 51907951 is 15970915.

It is a happy number.

51907951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15970915 = 5 ⋅3194183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51907951 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 51907951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51907957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312616 + ... + 312781.

It is an arithmetic number, because the mean of its divisors is an integer number (13133358).

Almost surely, 2^51907951 is an apocalyptic number.

51907951 is a deficient number, since it is larger than the sum of its proper divisors (625481).

51907951 is an equidigital number, since it uses as much as digits as its factorization.

51907951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625480.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 51907951 is about 7204.7172741198. The cubic root of 51907951 is about 373.0307459077.

The spelling of 51907951 in words is "fifty-one million, nine hundred seven thousand, nine hundred fifty-one".