138177691 has 2 divisors, whose sum is σ = 138177692. Its totient is φ = 138177690.

The previous prime is 138177659. The next prime is 138177701. The reversal of 138177691 is 196771831.

It is a happy number.

138177691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138177691 - 2⁵ = 138177659 is a prime.

It is not a weakly prime, because it can be changed into another prime (138177601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69088845 + 69088846.

It is an arithmetic number, because the mean of its divisors is an integer number (69088846).

Almost surely, 2^138177691 is an apocalyptic number.

138177691 is a deficient number, since it is larger than the sum of its proper divisors (1).

138177691 is an equidigital number, since it uses as much as digits as its factorization.

138177691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 138177691 is about 11754.9007226773. The cubic root of 138177691 is about 516.9866283594.

The spelling of 138177691 in words is "one hundred thirty-eight million, one hundred seventy-seven thousand, six hundred ninety-one".