138409131 has 16 divisors (see below), whose sum is σ = 215815424. Its totient is φ = 77251104.

The previous prime is 138409097. The next prime is 138409157. The reversal of 138409131 is 131904831.

It is not a de Polignac number, because 138409131 - 2⁷ = 138409003 is a prime.

It is a super-2 number, since 2×138409131² = 38314175088350322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138405131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75736 + ... + 77541.

It is an arithmetic number, because the mean of its divisors is an integer number (13488464).

Almost surely, 2^138409131 is an apocalyptic number.

138409131 is a deficient number, since it is larger than the sum of its proper divisors (77406293).

138409131 is a wasteful number, since it uses less digits than its factorization.

138409131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153330.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 138409131 is about 11764.7410086240. The cubic root of 138409131 is about 517.2751087051.

The spelling of 138409131 in words is "one hundred thirty-eight million, four hundred nine thousand, one hundred thirty-one".