138255671 has 2 divisors, whose sum is σ = 138255672. Its totient is φ = 138255670.

The previous prime is 138255619. The next prime is 138255683. The reversal of 138255671 is 176552831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138255671 is a prime.

It is a super-2 number, since 2×138255671² = 38229261127320482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138252671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69127835 + 69127836.

It is an arithmetic number, because the mean of its divisors is an integer number (69127836).

Almost surely, 2^138255671 is an apocalyptic number.

138255671 is a deficient number, since it is larger than the sum of its proper divisors (1).

138255671 is an equidigital number, since it uses as much as digits as its factorization.

138255671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 138255671 is about 11758.2171692821. The cubic root of 138255671 is about 517.0838631484.

The spelling of 138255671 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, six hundred seventy-one".