51375125 has 8 divisors (see below), whose sum is σ = 64116312. Its totient is φ = 41100000.

The previous prime is 51375119. The next prime is 51375127. The reversal of 51375125 is 52157315.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11546404 + 39828721 = 3398^2 + 6311^2 .

It is not a de Polignac number, because 51375125 - 2¹⁸ = 51112981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51375127) 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, 205376 + ... + 205625.

It is an arithmetic number, because the mean of its divisors is an integer number (8014539).

Almost surely, 2^51375125 is an apocalyptic number.

It is an amenable number.

51375125 is a deficient number, since it is larger than the sum of its proper divisors (12741187).

51375125 is an equidigital number, since it uses as much as digits as its factorization.

51375125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411016 (or 411006 counting only the distinct ones).

The product of its digits is 5250, while the sum is 29.

The square root of 51375125 is about 7167.6443131618. The cubic root of 51375125 is about 371.7499885807.

The spelling of 51375125 in words is "fifty-one million, three hundred seventy-five thousand, one hundred twenty-five".