998722746631 has 2 divisors, whose sum is σ = 998722746632. Its totient is φ = 998722746630.

The previous prime is 998722746563. The next prime is 998722746647. The reversal of 998722746631 is 136647227899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998722746631 - 2³⁵ = 964363008263 is a prime.

It is a super-2 number, since 2×998722746631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998722746661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499361373315 + 499361373316.

It is an arithmetic number, because the mean of its divisors is an integer number (499361373316).

Almost surely, 2^998722746631 is an apocalyptic number.

998722746631 is the 632052-nd centered pentagonal number.

998722746631 is a deficient number, since it is larger than the sum of its proper divisors (1).

998722746631 is an equidigital number, since it uses as much as digits as its factorization.

998722746631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 64.

The spelling of 998722746631 in words is "nine hundred ninety-eight billion, seven hundred twenty-two million, seven hundred forty-six thousand, six hundred thirty-one".