82915139 has 4 divisors (see below), whose sum is σ = 83238024. Its totient is φ = 82592256.

The previous prime is 82915123. The next prime is 82915181. The reversal of 82915139 is 93151928.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82915139 - 2⁴ = 82915123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82915199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161057 + ... + 161570.

It is an arithmetic number, because the mean of its divisors is an integer number (20809506).

Almost surely, 2^82915139 is an apocalyptic number.

82915139 is a deficient number, since it is larger than the sum of its proper divisors (322885).

82915139 is a wasteful number, since it uses less digits than its factorization.

82915139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322884.

The product of its digits is 19440, while the sum is 38.

The square root of 82915139 is about 9105.7750356573. The cubic root of 82915139 is about 436.0583539296.

The spelling of 82915139 in words is "eighty-two million, nine hundred fifteen thousand, one hundred thirty-nine".