90869057291 has 2 divisors, whose sum is σ = 90869057292. Its totient is φ = 90869057290.

The previous prime is 90869057269. The next prime is 90869057299. The reversal of 90869057291 is 19275096809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90869057291 - 2²² = 90864862987 is a prime.

It is not a weakly prime, because it can be changed into another prime (90869057299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45434528645 + 45434528646.

It is an arithmetic number, because the mean of its divisors is an integer number (45434528646).

Almost surely, 2^90869057291 is an apocalyptic number.

90869057291 is a deficient number, since it is larger than the sum of its proper divisors (1).

90869057291 is an equidigital number, since it uses as much as digits as its factorization.

90869057291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 90869057291 in words is "ninety billion, eight hundred sixty-nine million, fifty-seven thousand, two hundred ninety-one".