2090318930981 has 2 divisors, whose sum is σ = 2090318930982. Its totient is φ = 2090318930980.

The previous prime is 2090318930977. The next prime is 2090318930983. The reversal of 2090318930981 is 1890398130902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2046642110881 + 43676820100 = 1430609^2 + 208990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2090318930981 - 2² = 2090318930977 is a prime.

It is a super-2 number, since 2×2090318930981² (a number of 25 digits) contains 22 as substring.

Together with 2090318930983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2090318930983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045159465490 + 1045159465491.

It is an arithmetic number, because the mean of its divisors is an integer number (1045159465491).

Almost surely, 2^{2090318930981} is an apocalyptic number.

It is an amenable number.

2090318930981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2090318930981 is an equidigital number, since it uses as much as digits as its factorization.

2090318930981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 2090318930981 in words is "two trillion, ninety billion, three hundred eighteen million, nine hundred thirty thousand, nine hundred eighty-one".