992723397521 has 2 divisors, whose sum is σ = 992723397522. Its totient is φ = 992723397520.

The previous prime is 992723397487. The next prime is 992723397553. The reversal of 992723397521 is 125793327299.

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., 893176206400 + 99547191121 = 945080^2 + 315511^2 .

It is an emirp because it is prime and its reverse (125793327299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 992723397521 - 2¹⁸ = 992723135377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (992723397581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496361698760 + 496361698761.

It is an arithmetic number, because the mean of its divisors is an integer number (496361698761).

Almost surely, 2^992723397521 is an apocalyptic number.

It is an amenable number.

992723397521 is a deficient number, since it is larger than the sum of its proper divisors (1).

992723397521 is an equidigital number, since it uses as much as digits as its factorization.

992723397521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12859560, while the sum is 59.

The spelling of 992723397521 in words is "nine hundred ninety-two billion, seven hundred twenty-three million, three hundred ninety-seven thousand, five hundred twenty-one".