51125415 has 16 divisors (see below), whose sum is σ = 89237376. Its totient is φ = 24788000.

The previous prime is 51125413. The next prime is 51125419. The reversal of 51125415 is 51452115.

It is not a de Polignac number, because 51125415 - 2¹ = 51125413 is a prime.

It is a super-2 number, since 2×51125415² = 5227616117844450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51125413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154761 + ... + 155090.

It is an arithmetic number, because the mean of its divisors is an integer number (5577336).

Almost surely, 2^51125415 is an apocalyptic number.

51125415 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51125415 is a deficient number, since it is larger than the sum of its proper divisors (38111961).

51125415 is a wasteful number, since it uses less digits than its factorization.

51125415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309870.

The product of its digits is 1000, while the sum is 24.

The square root of 51125415 is about 7150.2038432481. The cubic root of 51125415 is about 371.1467102601.

The spelling of 51125415 in words is "fifty-one million, one hundred twenty-five thousand, four hundred fifteen".