51499625 has 16 divisors (see below), whose sum is σ = 65370240. Its totient is φ = 40495600.

The previous prime is 51499601. The next prime is 51499631. The reversal of 51499625 is 52699415.

It is not a de Polignac number, because 51499625 - 2¹⁸ = 51237481 is a prime.

It is a super-2 number, since 2×51499625² = 5304422750281250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3884 + ... + 10866.

It is an arithmetic number, because the mean of its divisors is an integer number (4085640).

Almost surely, 2^51499625 is an apocalyptic number.

It is an amenable number.

51499625 is a deficient number, since it is larger than the sum of its proper divisors (13870615).

51499625 is an equidigital number, since it uses as much as digits as its factorization.

51499625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057 (or 7047 counting only the distinct ones).

The product of its digits is 97200, while the sum is 41.

The square root of 51499625 is about 7176.3239196681. The cubic root of 51499625 is about 372.0500399984.

The spelling of 51499625 in words is "fifty-one million, four hundred ninety-nine thousand, six hundred twenty-five".