51269805 has 12 divisors (see below), whose sum is σ = 88867740. Its totient is φ = 27343872.

The previous prime is 51269791. The next prime is 51269819. The reversal of 51269805 is 50896215.

It is a happy number.

51269805 is a `hidden beast` number, since 512 + 69 + 80 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (51269791) and next prime (51269819).

It can be written as a sum of positive squares in 2 ways, for example, as 21261321 + 30008484 = 4611^2 + 5478^2 .

It is not a de Polignac number, because 51269805 - 2⁸ = 51269549 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51269805.

It is a congruent number.

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, 569620 + ... + 569709.

It is an arithmetic number, because the mean of its divisors is an integer number (7405645).

Almost surely, 2^51269805 is an apocalyptic number.

It is an amenable number.

51269805 is a deficient number, since it is larger than the sum of its proper divisors (37597935).

51269805 is a wasteful number, since it uses less digits than its factorization.

51269805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139340 (or 1139337 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 51269805 is about 7160.2936392302. The cubic root of 51269805 is about 371.4957832371.

The spelling of 51269805 in words is "fifty-one million, two hundred sixty-nine thousand, eight hundred five".