51385825 has 12 divisors (see below), whose sum is σ = 65916540. Its totient is φ = 39690560.

The previous prime is 51385819. The next prime is 51385837. The reversal of 51385825 is 52858315.

It can be written as a sum of positive squares in 6 ways, for example, as 2483776 + 48902049 = 1576^2 + 6993^2 .

It is not a de Polignac number, because 51385825 - 2⁵ = 51385793 is a prime.

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, 34714 + ... + 36163.

It is an arithmetic number, because the mean of its divisors is an integer number (5493045).

Almost surely, 2^51385825 is an apocalyptic number.

It is an amenable number.

51385825 is a deficient number, since it is larger than the sum of its proper divisors (14530715).

51385825 is a wasteful number, since it uses less digits than its factorization.

51385825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70916 (or 70911 counting only the distinct ones).

The product of its digits is 48000, while the sum is 37.

The square root of 51385825 is about 7168.3906841076. The cubic root of 51385825 is about 371.7757951603.

The spelling of 51385825 in words is "fifty-one million, three hundred eighty-five thousand, eight hundred twenty-five".