90189791909293 has 2 divisors, whose sum is σ = 90189791909294. Its totient is φ = 90189791909292.

The previous prime is 90189791909267. The next prime is 90189791909303. The reversal of 90189791909293 is 39290919798109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74391090750729 + 15798701158564 = 8625027^2 + 3974758^2 .

It is a cyclic number.

It is not a de Polignac number, because 90189791909293 - 2²⁹ = 90189255038381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90189791909213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45094895954646 + 45094895954647.

It is an arithmetic number, because the mean of its divisors is an integer number (45094895954647).

Almost surely, 2^{90189791909293} is an apocalyptic number.

It is an amenable number.

90189791909293 is a deficient number, since it is larger than the sum of its proper divisors (1).

90189791909293 is an equidigital number, since it uses as much as digits as its factorization.

90189791909293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 178564176, while the sum is 76.

The spelling of 90189791909293 in words is "ninety trillion, one hundred eighty-nine billion, seven hundred ninety-one million, nine hundred nine thousand, two hundred ninety-three".