90914668981 has 2 divisors, whose sum is σ = 90914668982. Its totient is φ = 90914668980.

The previous prime is 90914668799. The next prime is 90914668997. The reversal of 90914668981 is 18986641909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90260588356 + 654080625 = 300434^2 + 25575^2 .

It is a cyclic number.

It is not a de Polignac number, because 90914668981 - 2²³ = 90906280373 is a prime.

It is a super-2 number, since 2×90914668981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90914668681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45457334490 + 45457334491.

It is an arithmetic number, because the mean of its divisors is an integer number (45457334491).

Almost surely, 2^90914668981 is an apocalyptic number.

It is an amenable number.

90914668981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90914668981 is an equidigital number, since it uses as much as digits as its factorization.

90914668981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 61.

The spelling of 90914668981 in words is "ninety billion, nine hundred fourteen million, six hundred sixty-eight thousand, nine hundred eighty-one".