8156938901 has 2 divisors, whose sum is σ = 8156938902. Its totient is φ = 8156938900.

The previous prime is 8156938831. The next prime is 8156938921. The reversal of 8156938901 is 1098396518.

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., 6983944900 + 1172994001 = 83570^2 + 34249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8156938901 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8156938901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8156938921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078469450 + 4078469451.

It is an arithmetic number, because the mean of its divisors is an integer number (4078469451).

Almost surely, 2^8156938901 is an apocalyptic number.

It is an amenable number.

8156938901 is a deficient number, since it is larger than the sum of its proper divisors (1).

8156938901 is an equidigital number, since it uses as much as digits as its factorization.

8156938901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 8156938901 is about 90315.7732680178. The cubic root of 8156938901 is about 2012.9936415745.

The spelling of 8156938901 in words is "eight billion, one hundred fifty-six million, nine hundred thirty-eight thousand, nine hundred one".