51647915 has 16 divisors (see below), whose sum is σ = 67931136. Its totient is φ = 37384800.

The previous prime is 51647879. The next prime is 51647963. The reversal of 51647915 is 51974615.

It is not a de Polignac number, because 51647915 - 2⁶ = 51647851 is a prime.

It is a Duffinian 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, 10160 + ... + 14370.

It is an arithmetic number, because the mean of its divisors is an integer number (4245696).

Almost surely, 2^51647915 is an apocalyptic number.

51647915 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51647915 is a deficient number, since it is larger than the sum of its proper divisors (16283221).

51647915 is a wasteful number, since it uses less digits than its factorization.

51647915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450.

The product of its digits is 37800, while the sum is 38.

The square root of 51647915 is about 7186.6483843305. The cubic root of 51647915 is about 372.4067961939.

The spelling of 51647915 in words is "fifty-one million, six hundred forty-seven thousand, nine hundred fifteen".