992890687721 has 2 divisors, whose sum is σ = 992890687722. Its totient is φ = 992890687720.

The previous prime is 992890687699. The next prime is 992890687793. The reversal of 992890687721 is 127786098299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556234047721 + 436656640000 = 745811^2 + 660800^2 .

It is a cyclic number.

It is not a de Polignac number, because 992890687721 - 2³⁸ = 718012780777 is a prime.

It is not a weakly prime, because it can be changed into another prime (992890617721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496445343860 + 496445343861.

It is an arithmetic number, because the mean of its divisors is an integer number (496445343861).

Almost surely, 2^992890687721 is an apocalyptic number.

It is an amenable number.

992890687721 is a deficient number, since it is larger than the sum of its proper divisors (1).

992890687721 is an equidigital number, since it uses as much as digits as its factorization.

992890687721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54867456, while the sum is 68.

The spelling of 992890687721 in words is "nine hundred ninety-two billion, eight hundred ninety million, six hundred eighty-seven thousand, seven hundred twenty-one".