90691042291 has 2 divisors, whose sum is σ = 90691042292. Its totient is φ = 90691042290.

The previous prime is 90691042241. The next prime is 90691042297. The reversal of 90691042291 is 19224019609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90691042291 - 2⁷ = 90691042163 is a prime.

It is not a weakly prime, because it can be changed into another prime (90691042297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45345521145 + 45345521146.

It is an arithmetic number, because the mean of its divisors is an integer number (45345521146).

Almost surely, 2^90691042291 is an apocalyptic number.

90691042291 is a deficient number, since it is larger than the sum of its proper divisors (1).

90691042291 is an equidigital number, since it uses as much as digits as its factorization.

90691042291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 90691042291 in words is "ninety billion, six hundred ninety-one million, forty-two thousand, two hundred ninety-one".