51772565 has 16 divisors (see below), whose sum is σ = 70843248. Its totient is φ = 35982336.

The previous prime is 51772543. The next prime is 51772577. The reversal of 51772565 is 56527715.

It can be written as a sum of positive squares in 8 ways, for example, as 1957201 + 49815364 = 1399^2 + 7058^2 .

It is not a de Polignac number, because 51772565 - 2¹⁴ = 51756181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22322 + ... + 24531.

It is an arithmetic number, because the mean of its divisors is an integer number (4427703).

Almost surely, 2^51772565 is an apocalyptic number.

It is an amenable number.

51772565 is a deficient number, since it is larger than the sum of its proper divisors (19070683).

51772565 is a wasteful number, since it uses less digits than its factorization.

51772565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46888.

The product of its digits is 73500, while the sum is 38.

The square root of 51772565 is about 7195.3154899559. The cubic root of 51772565 is about 372.7061513729.

The spelling of 51772565 in words is "fifty-one million, seven hundred seventy-two thousand, five hundred sixty-five".