90815211023 has 2 divisors, whose sum is σ = 90815211024. Its totient is φ = 90815211022.

The previous prime is 90815210999. The next prime is 90815211083. The reversal of 90815211023 is 32011251809.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90815211023 - 2¹⁸ = 90814948879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90815211083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45407605511 + 45407605512.

It is an arithmetic number, because the mean of its divisors is an integer number (45407605512).

Almost surely, 2^90815211023 is an apocalyptic number.

90815211023 is a deficient number, since it is larger than the sum of its proper divisors (1).

90815211023 is an equidigital number, since it uses as much as digits as its factorization.

90815211023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 90815211023 in words is "ninety billion, eight hundred fifteen million, two hundred eleven thousand, twenty-three".