51644525 has 12 divisors (see below), whose sum is σ = 65249172. Its totient is φ = 40535040.

The previous prime is 51644501. The next prime is 51644533. The reversal of 51644525 is 52544615.

It can be written as a sum of positive squares in 6 ways, for example, as 4351396 + 47293129 = 2086^2 + 6877^2 .

It is not a de Polignac number, because 51644525 - 2¹² = 51640429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51644491 and 51644500.

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, 18164 + ... + 20813.

It is an arithmetic number, because the mean of its divisors is an integer number (5437431).

Almost surely, 2^51644525 is an apocalyptic number.

It is an amenable number.

51644525 is a deficient number, since it is larger than the sum of its proper divisors (13604647).

51644525 is a wasteful number, since it uses less digits than its factorization.

51644525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39040 (or 39035 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 51644525 is about 7186.4125264279. The cubic root of 51644525 is about 372.3986481615.

The spelling of 51644525 in words is "fifty-one million, six hundred forty-four thousand, five hundred twenty-five".