90009459797 has 2 divisors, whose sum is σ = 90009459798. Its totient is φ = 90009459796.

The previous prime is 90009459763. The next prime is 90009459857. The reversal of 90009459797 is 79795490009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81039286276 + 8970173521 = 284674^2 + 94711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90009459797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90009459497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45004729898 + 45004729899.

It is an arithmetic number, because the mean of its divisors is an integer number (45004729899).

Almost surely, 2^90009459797 is an apocalyptic number.

It is an amenable number.

90009459797 is a deficient number, since it is larger than the sum of its proper divisors (1).

90009459797 is an equidigital number, since it uses as much as digits as its factorization.

90009459797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6429780, while the sum is 59.

The spelling of 90009459797 in words is "ninety billion, nine million, four hundred fifty-nine thousand, seven hundred ninety-seven".