9138171877 has 2 divisors, whose sum is σ = 9138171878. Its totient is φ = 9138171876.

The previous prime is 9138171841. The next prime is 9138171893. The reversal of 9138171877 is 7781718319.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6913257316 + 2224914561 = 83146^2 + 47169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9138171877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9138177877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569085938 + 4569085939.

It is an arithmetic number, because the mean of its divisors is an integer number (4569085939).

Almost surely, 2^9138171877 is an apocalyptic number.

It is an amenable number.

9138171877 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138171877 is an equidigital number, since it uses as much as digits as its factorization.

9138171877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 52.

The square root of 9138171877 is about 95593.7857656030. The cubic root of 9138171877 is about 2090.6745895162.

The spelling of 9138171877 in words is "nine billion, one hundred thirty-eight million, one hundred seventy-one thousand, eight hundred seventy-seven".