992945621 has 2 divisors, whose sum is σ = 992945622. Its totient is φ = 992945620.

The previous prime is 992945543. The next prime is 992945669. The reversal of 992945621 is 126549299.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992943121 + 2500 = 31511^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 992945621 - 2¹⁴ = 992929237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (992945671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496472810 + 496472811.

It is an arithmetic number, because the mean of its divisors is an integer number (496472811).

Almost surely, 2^992945621 is an apocalyptic number.

It is an amenable number.

992945621 is a deficient number, since it is larger than the sum of its proper divisors (1).

992945621 is an equidigital number, since it uses as much as digits as its factorization.

992945621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The square root of 992945621 is about 31511.0396686622. The cubic root of 992945621 is about 997.6429891982.

The spelling of 992945621 in words is "nine hundred ninety-two million, nine hundred forty-five thousand, six hundred twenty-one".