138257788531 has 16 divisors (see below), whose sum is σ = 146168386560. Its totient is φ = 130507153920.

The previous prime is 138257788517. The next prime is 138257788597. The reversal of 138257788531 is 135887752831.

It is a cyclic number.

It is not a de Polignac number, because 138257788531 - 2⁵ = 138257788499 is a prime.

It is a super-2 number, since 2×138257788531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138257785531) 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, 3821316 + ... + 3857326.

It is an arithmetic number, because the mean of its divisors is an integer number (9135524160).

Almost surely, 2^138257788531 is an apocalyptic number.

138257788531 is a deficient number, since it is larger than the sum of its proper divisors (7910598029).

138257788531 is a wasteful number, since it uses less digits than its factorization.

138257788531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38226.

The product of its digits is 11289600, while the sum is 58.

The spelling of 138257788531 in words is "one hundred thirty-eight billion, two hundred fifty-seven million, seven hundred eighty-eight thousand, five hundred thirty-one".