90947163641 has 2 divisors, whose sum is σ = 90947163642. Its totient is φ = 90947163640.

The previous prime is 90947163557. The next prime is 90947163719. The reversal of 90947163641 is 14636174909.

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., 90854619241 + 92544400 = 301421^2 + 9620^2 .

It is a cyclic number.

It is not a de Polignac number, because 90947163641 - 2¹⁴ = 90947147257 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 90947163641.

It is not a weakly prime, because it can be changed into another prime (90947163841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45473581820 + 45473581821.

It is an arithmetic number, because the mean of its divisors is an integer number (45473581821).

Almost surely, 2^90947163641 is an apocalyptic number.

It is an amenable number.

90947163641 is a deficient number, since it is larger than the sum of its proper divisors (1).

90947163641 is an equidigital number, since it uses as much as digits as its factorization.

90947163641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 90947163641 in words is "ninety billion, nine hundred forty-seven million, one hundred sixty-three thousand, six hundred forty-one".