138195023431 has 2 divisors, whose sum is σ = 138195023432. Its totient is φ = 138195023430.

The previous prime is 138195023401. The next prime is 138195023443. The reversal of 138195023431 is 134320591831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138195023431 - 2¹⁵ = 138194990663 is a prime.

It is a super-2 number, since 2×138195023431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138195023401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69097511715 + 69097511716.

It is an arithmetic number, because the mean of its divisors is an integer number (69097511716).

Almost surely, 2^138195023431 is an apocalyptic number.

138195023431 is a deficient number, since it is larger than the sum of its proper divisors (1).

138195023431 is an equidigital number, since it uses as much as digits as its factorization.

138195023431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 138195023431 in words is "one hundred thirty-eight billion, one hundred ninety-five million, twenty-three thousand, four hundred thirty-one".