51125015 has 8 divisors (see below), whose sum is σ = 62356128. Its totient is φ = 40229280.

The previous prime is 51125003. The next prime is 51125023. The reversal of 51125015 is 51052115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51125015 - 2⁶ = 51124951 is a prime.

It is a super-2 number, since 2×51125015² = 5227534317500450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 83507 + ... + 84116.

It is an arithmetic number, because the mean of its divisors is an integer number (7794516).

Almost surely, 2^51125015 is an apocalyptic number.

51125015 is a deficient number, since it is larger than the sum of its proper divisors (11231113).

51125015 is a wasteful number, since it uses less digits than its factorization.

51125015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167689.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51125015 is about 7150.1758719629. The cubic root of 51125015 is about 371.1457423197.

Subtracting from 51125015 its reverse (51052115), we obtain a square (72900 = 270²).

The spelling of 51125015 in words is "fifty-one million, one hundred twenty-five thousand, fifteen".