8161915901 has 2 divisors, whose sum is σ = 8161915902. Its totient is φ = 8161915900.

The previous prime is 8161915859. The next prime is 8161915903. The reversal of 8161915901 is 1095191618.

It is a happy number.

8161915901 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6951223876 + 1210692025 = 83374^2 + 34795^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161915901 - 2¹⁸ = 8161653757 is a prime.

Together with 8161915903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8161915903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080957950 + 4080957951.

It is an arithmetic number, because the mean of its divisors is an integer number (4080957951).

Almost surely, 2^8161915901 is an apocalyptic number.

It is an amenable number.

8161915901 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161915901 is an equidigital number, since it uses as much as digits as its factorization.

8161915901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 41.

The square root of 8161915901 is about 90343.3223929694. The cubic root of 8161915901 is about 2013.4029712882.

The spelling of 8161915901 in words is "eight billion, one hundred sixty-one million, nine hundred fifteen thousand, nine hundred one".