138706131 has 16 divisors (see below), whose sum is σ = 188559360. Its totient is φ = 90671520.

The previous prime is 138706103. The next prime is 138706153. The reversal of 138706131 is 131607831.

It is a de Polignac number, because none of the positive numbers 2^k-138706131 is a prime.

It is a super-2 number, since 2×138706131² = 38478781553978322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138706181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69100 + ... + 71078.

It is an arithmetic number, because the mean of its divisors is an integer number (11784960).

Almost surely, 2^138706131 is an apocalyptic number.

138706131 is a deficient number, since it is larger than the sum of its proper divisors (49853229).

138706131 is a wasteful number, since it uses less digits than its factorization.

138706131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 138706131 is about 11777.3567068337. The cubic root of 138706131 is about 517.6448361199.

The spelling of 138706131 in words is "one hundred thirty-eight million, seven hundred six thousand, one hundred thirty-one".