90231748993 has 2 divisors, whose sum is σ = 90231748994. Its totient is φ = 90231748992.

The previous prime is 90231748979. The next prime is 90231749063. The reversal of 90231748993 is 39984713209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84778221889 + 5453527104 = 291167^2 + 73848^2 .

It is a cyclic number.

It is not a de Polignac number, because 90231748993 - 2²⁵ = 90198194561 is a prime.

It is not a weakly prime, because it can be changed into another prime (90231748903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45115874496 + 45115874497.

It is an arithmetic number, because the mean of its divisors is an integer number (45115874497).

Almost surely, 2^90231748993 is an apocalyptic number.

It is an amenable number.

90231748993 is a deficient number, since it is larger than the sum of its proper divisors (1).

90231748993 is an equidigital number, since it uses as much as digits as its factorization.

90231748993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 90231748993 in words is "ninety billion, two hundred thirty-one million, seven hundred forty-eight thousand, nine hundred ninety-three".