51263865 has 12 divisors (see below), whose sum is σ = 88857444. Its totient is φ = 27340704.

The previous prime is 51263813. The next prime is 51263923. The reversal of 51263865 is 56836215.

51263865 is a `hidden beast` number, since 5 + 12 + 638 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 18224361 = 5748^2 + 4269^2 .

It is not a de Polignac number, because 51263865 - 2⁸ = 51263609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 569554 + ... + 569643.

It is an arithmetic number, because the mean of its divisors is an integer number (7404787).

Almost surely, 2^51263865 is an apocalyptic number.

It is an amenable number.

51263865 is a deficient number, since it is larger than the sum of its proper divisors (37593579).

51263865 is a wasteful number, since it uses less digits than its factorization.

51263865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139208 (or 1139205 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 51263865 is about 7159.8788397570. The cubic root of 51263865 is about 371.4814358047.

The spelling of 51263865 in words is "fifty-one million, two hundred sixty-three thousand, eight hundred sixty-five".