90121233997 has 2 divisors, whose sum is σ = 90121233998. Its totient is φ = 90121233996.

The previous prime is 90121233947. The next prime is 90121234031. The reversal of 90121233997 is 79933212109.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89576898436 + 544335561 = 299294^2 + 23331^2 .

It is a cyclic number.

It is not a de Polignac number, because 90121233997 - 2¹⁵ = 90121201229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90121233947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45060616998 + 45060616999.

It is an arithmetic number, because the mean of its divisors is an integer number (45060616999).

Almost surely, 2^90121233997 is an apocalyptic number.

It is an amenable number.

90121233997 is a deficient number, since it is larger than the sum of its proper divisors (1).

90121233997 is an equidigital number, since it uses as much as digits as its factorization.

90121233997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 46.

The spelling of 90121233997 in words is "ninety billion, one hundred twenty-one million, two hundred thirty-three thousand, nine hundred ninety-seven".