138926885731 has 2 divisors, whose sum is σ = 138926885732. Its totient is φ = 138926885730.

The previous prime is 138926885729. The next prime is 138926885759. The reversal of 138926885731 is 137588629831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138926885731 - 2¹ = 138926885729 is a prime.

It is a super-2 number, since 2×138926885731² (a number of 23 digits) contains 22 as substring.

Together with 138926885729, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 138926885731.

It is not a weakly prime, because it can be changed into another prime (138926885231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69463442865 + 69463442866.

It is an arithmetic number, because the mean of its divisors is an integer number (69463442866).

Almost surely, 2^138926885731 is an apocalyptic number.

138926885731 is a deficient number, since it is larger than the sum of its proper divisors (1).

138926885731 is an equidigital number, since it uses as much as digits as its factorization.

138926885731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 61.

The spelling of 138926885731 in words is "one hundred thirty-eight billion, nine hundred twenty-six million, eight hundred eighty-five thousand, seven hundred thirty-one".