992640247 has 2 divisors, whose sum is σ = 992640248. Its totient is φ = 992640246.

The previous prime is 992640211. The next prime is 992640263. The reversal of 992640247 is 742046299.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 992640247 - 2¹⁹ = 992115959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (992640277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496320123 + 496320124.

It is an arithmetic number, because the mean of its divisors is an integer number (496320124).

Almost surely, 2^992640247 is an apocalyptic number.

992640247 is a deficient number, since it is larger than the sum of its proper divisors (1).

992640247 is an equidigital number, since it uses as much as digits as its factorization.

992640247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 992640247 is about 31506.1937878888. The cubic root of 992640247 is about 997.5407058302.

The spelling of 992640247 in words is "nine hundred ninety-two million, six hundred forty thousand, two hundred forty-seven".