90200768981 has 2 divisors, whose sum is σ = 90200768982. Its totient is φ = 90200768980.

The previous prime is 90200768951. The next prime is 90200769017. The reversal of 90200768981 is 18986700209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89970002500 + 230766481 = 299950^2 + 15191^2 .

It is a cyclic number.

It is not a de Polignac number, because 90200768981 - 2¹⁰ = 90200767957 is a prime.

It is a super-2 number, since 2×90200768981² (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 (90200768951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45100384490 + 45100384491.

It is an arithmetic number, because the mean of its divisors is an integer number (45100384491).

Almost surely, 2^90200768981 is an apocalyptic number.

It is an amenable number.

90200768981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90200768981 is an equidigital number, since it uses as much as digits as its factorization.

90200768981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 90200768981 in words is "ninety billion, two hundred million, seven hundred sixty-eight thousand, nine hundred eighty-one".