51739915 has 16 divisors (see below), whose sum is σ = 64540800. Its totient is φ = 39770752.

The previous prime is 51739913. The next prime is 51739921. The reversal of 51739915 is 51993715.

It is a cyclic number.

It is not a de Polignac number, because 51739915 - 2¹ = 51739913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51739913) 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, 33909 + ... + 35401.

It is an arithmetic number, because the mean of its divisors is an integer number (4033800).

Almost surely, 2^51739915 is an apocalyptic number.

51739915 is a deficient number, since it is larger than the sum of its proper divisors (12800885).

51739915 is a wasteful number, since it uses less digits than its factorization.

51739915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766.

The product of its digits is 42525, while the sum is 40.

The square root of 51739915 is about 7193.0462948601. The cubic root of 51739915 is about 372.6277867357.

The spelling of 51739915 in words is "fifty-one million, seven hundred thirty-nine thousand, nine hundred fifteen".