138892031 has 2 divisors, whose sum is σ = 138892032. Its totient is φ = 138892030.

The previous prime is 138892001. The next prime is 138892037. The reversal of 138892031 is 130298831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138892031 - 2⁶ = 138891967 is a prime.

It is a super-2 number, since 2×138892031² = 38581992550609922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138891982 and 138892000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138892037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69446015 + 69446016.

It is an arithmetic number, because the mean of its divisors is an integer number (69446016).

Almost surely, 2^138892031 is an apocalyptic number.

138892031 is a deficient number, since it is larger than the sum of its proper divisors (1).

138892031 is an equidigital number, since it uses as much as digits as its factorization.

138892031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 138892031 is about 11785.2463275063. The cubic root of 138892031 is about 517.8759896041.

The spelling of 138892031 in words is "one hundred thirty-eight million, eight hundred ninety-two thousand, thirty-one".