90070241981 has 2 divisors, whose sum is σ = 90070241982. Its totient is φ = 90070241980.

The previous prime is 90070241951. The next prime is 90070242023. The reversal of 90070241981 is 18914207009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46677602500 + 43392639481 = 216050^2 + 208309^2 .

It is a cyclic number.

It is not a de Polignac number, because 90070241981 - 2²² = 90066047677 is a prime.

It is a super-2 number, since 2×90070241981² (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 (90070241951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45035120990 + 45035120991.

It is an arithmetic number, because the mean of its divisors is an integer number (45035120991).

Almost surely, 2^90070241981 is an apocalyptic number.

It is an amenable number.

90070241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90070241981 is an equidigital number, since it uses as much as digits as its factorization.

90070241981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 90070241981 in words is "ninety billion, seventy million, two hundred forty-one thousand, nine hundred eighty-one".