65915139 has 16 divisors (see below), whose sum is σ = 89147520. Its totient is φ = 43318080.

The previous prime is 65915119. The next prime is 65915147. The reversal of 65915139 is 93151956.

It is not a de Polignac number, because 65915139 - 2⁵ = 65915107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65915097 and 65915106.

It is not an unprimeable number, because it can be changed into a prime (65915119) 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, 69879 + ... + 70815.

It is an arithmetic number, because the mean of its divisors is an integer number (5571720).

Almost surely, 2^65915139 is an apocalyptic number.

65915139 is a deficient number, since it is larger than the sum of its proper divisors (23232381).

65915139 is a wasteful number, since it uses less digits than its factorization.

65915139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250.

The product of its digits is 36450, while the sum is 39.

The square root of 65915139 is about 8118.8138912036. The cubic root of 65915139 is about 403.9507239021.

The spelling of 65915139 in words is "sixty-five million, nine hundred fifteen thousand, one hundred thirty-nine".