51489715 has 16 divisors (see below), whose sum is σ = 65268000. Its totient is φ = 38886912.

The previous prime is 51489689. The next prime is 51489721. The reversal of 51489715 is 51798415.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51489715 - 2²⁵ = 17935283 is a prime.

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, 32379 + ... + 33931.

It is an arithmetic number, because the mean of its divisors is an integer number (4079250).

Almost surely, 2^51489715 is an apocalyptic number.

51489715 is a deficient number, since it is larger than the sum of its proper divisors (13778285).

51489715 is a wasteful number, since it uses less digits than its factorization.

51489715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926.

The product of its digits is 50400, while the sum is 40.

The square root of 51489715 is about 7175.6334215176. The cubic root of 51489715 is about 372.0261741132.

The spelling of 51489715 in words is "fifty-one million, four hundred eighty-nine thousand, seven hundred fifteen".