992639801 has 2 divisors, whose sum is σ = 992639802. Its totient is φ = 992639800.

The previous prime is 992639779. The next prime is 992639831. The reversal of 992639801 is 108936299.

Added to its reverse (108936299) it gives a square (1101576100 = 33190²).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665898025 + 326741776 = 25805^2 + 18076^2 .

It is an emirp because it is prime and its reverse (108936299) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-992639801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (992639831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496319900 + 496319901.

It is an arithmetic number, because the mean of its divisors is an integer number (496319901).

Almost surely, 2^992639801 is an apocalyptic number.

It is an amenable number.

992639801 is a deficient number, since it is larger than the sum of its proper divisors (1).

992639801 is an equidigital number, since it uses as much as digits as its factorization.

992639801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 992639801 is about 31506.1867099146. The cubic root of 992639801 is about 997.5405564296.

Adding to 992639801 its reverse (108936299), we get a square (1101576100 = 33190²).

The spelling of 992639801 in words is "nine hundred ninety-two million, six hundred thirty-nine thousand, eight hundred one".