51232805 has 16 divisors (see below), whose sum is σ = 66561264. Its totient is φ = 37632000.

The previous prime is 51232789. The next prime is 51232807. The reversal of 51232805 is 50823215.

It can be written as a sum of positive squares in 8 ways, for example, as 2819041 + 48413764 = 1679^2 + 6958^2 .

It is not a de Polignac number, because 51232805 - 2⁴ = 51232789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51232807) 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, 10805 + ... + 14805.

It is an arithmetic number, because the mean of its divisors is an integer number (4160079).

Almost surely, 2^51232805 is an apocalyptic number.

It is an amenable number.

51232805 is a deficient number, since it is larger than the sum of its proper divisors (15328459).

51232805 is a wasteful number, since it uses less digits than its factorization.

51232805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51232805 is about 7157.7094799943. The cubic root of 51232805 is about 371.4063956541.

The spelling of 51232805 in words is "fifty-one million, two hundred thirty-two thousand, eight hundred five".