51051625 has 8 divisors (see below), whose sum is σ = 63712584. Its totient is φ = 40841200.

The previous prime is 51051577. The next prime is 51051631. The reversal of 51051625 is 52615015.

It can be written as a sum of positive squares in 4 ways, for example, as 755161 + 50296464 = 869^2 + 7092^2 .

It is not a de Polignac number, because 51051625 - 2⁹ = 51051113 is a prime.

It is a super-3 number, since 3×51051625³ (a number of 24 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51051625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204082 + ... + 204331.

It is an arithmetic number, because the mean of its divisors is an integer number (7964073).

Almost surely, 2^51051625 is an apocalyptic number.

It is an amenable number.

51051625 is a deficient number, since it is larger than the sum of its proper divisors (12660959).

51051625 is an equidigital number, since it uses as much as digits as its factorization.

51051625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408428 (or 408418 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51051625 is about 7145.0419872804. The cubic root of 51051625 is about 370.9680639365.

The spelling of 51051625 in words is "fifty-one million, fifty-one thousand, six hundred twenty-five".