998712997 has 2 divisors, whose sum is σ = 998712998. Its totient is φ = 998712996.

The previous prime is 998712983. The next prime is 998713031. The reversal of 998712997 is 799217899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622702116 + 376010881 = 24954^2 + 19391^2 .

It is a cyclic number.

It is not a de Polignac number, because 998712997 - 2²³ = 990324389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998712907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499356498 + 499356499.

It is an arithmetic number, because the mean of its divisors is an integer number (499356499).

Almost surely, 2^998712997 is an apocalyptic number.

It is an amenable number.

998712997 is a deficient number, since it is larger than the sum of its proper divisors (1).

998712997 is an equidigital number, since it uses as much as digits as its factorization.

998712997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 61.

The square root of 998712997 is about 31602.4207458859. The cubic root of 998712997 is about 999.5708148264.

The spelling of 998712997 in words is "nine hundred ninety-eight million, seven hundred twelve thousand, nine hundred ninety-seven".