51731125 has 8 divisors (see below), whose sum is σ = 64560600. Its totient is φ = 41384800.

The previous prime is 51731123. The next prime is 51731137. The reversal of 51731125 is 52113715.

It can be written as a sum of positive squares in 4 ways, for example, as 1136356 + 50594769 = 1066^2 + 7113^2 .

It is not a de Polignac number, because 51731125 - 2¹ = 51731123 is a prime.

It is a super-2 number, since 2×51731125² = 5352218587531250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 51731125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206800 + ... + 207049.

It is an arithmetic number, because the mean of its divisors is an integer number (8070075).

Almost surely, 2^51731125 is an apocalyptic number.

It is an amenable number.

51731125 is a deficient number, since it is larger than the sum of its proper divisors (12829475).

51731125 is an equidigital number, since it uses as much as digits as its factorization.

51731125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413864 (or 413854 counting only the distinct ones).

The product of its digits is 1050, while the sum is 25.

The square root of 51731125 is about 7192.4352621348. The cubic root of 51731125 is about 372.6066838551.

The spelling of 51731125 in words is "fifty-one million, seven hundred thirty-one thousand, one hundred twenty-five".