138696577 has 4 divisors (see below), whose sum is σ = 141647616. Its totient is φ = 135745540.

The previous prime is 138696559. The next prime is 138696581. The reversal of 138696577 is 775696831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138696577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138696527) 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, 1475449 + ... + 1475542.

It is an arithmetic number, because the mean of its divisors is an integer number (35411904).

Almost surely, 2^138696577 is an apocalyptic number.

It is an amenable number.

138696577 is a deficient number, since it is larger than the sum of its proper divisors (2951039).

138696577 is an equidigital number, since it uses as much as digits as its factorization.

138696577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951038.

The product of its digits is 1905120, while the sum is 52.

The square root of 138696577 is about 11776.9510910082. The cubic root of 138696577 is about 517.6329508190.

The spelling of 138696577 in words is "one hundred thirty-eight million, six hundred ninety-six thousand, five hundred seventy-seven".