69138515 has 4 divisors (see below), whose sum is σ = 82966224. Its totient is φ = 55310808.

The previous prime is 69138497. The next prime is 69138527. The reversal of 69138515 is 51583196.

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 69138515 - 2²² = 64944211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6913847 + ... + 6913856.

It is an arithmetic number, because the mean of its divisors is an integer number (20741556).

Almost surely, 2^69138515 is an apocalyptic number.

69138515 is a deficient number, since it is larger than the sum of its proper divisors (13827709).

69138515 is a wasteful number, since it uses less digits than its factorization.

69138515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13827708.

The product of its digits is 32400, while the sum is 38.

The square root of 69138515 is about 8314.9573059638. The cubic root of 69138515 is about 410.4308676864.

The spelling of 69138515 in words is "sixty-nine million, one hundred thirty-eight thousand, five hundred fifteen".