998458631 has 2 divisors, whose sum is σ = 998458632. Its totient is φ = 998458630.

The previous prime is 998458583. The next prime is 998458649. The reversal of 998458631 is 136854899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998458631 - 2¹⁸ = 998196487 is a prime.

It is a super-2 number, since 2×998458631² = 1993839275636788322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998458231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499229315 + 499229316.

It is an arithmetic number, because the mean of its divisors is an integer number (499229316).

Almost surely, 2^998458631 is an apocalyptic number.

998458631 is a deficient number, since it is larger than the sum of its proper divisors (1).

998458631 is an equidigital number, since it uses as much as digits as its factorization.

998458631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 998458631 is about 31598.3960194185. The cubic root of 998458631 is about 999.4859461272.

The spelling of 998458631 in words is "nine hundred ninety-eight million, four hundred fifty-eight thousand, six hundred thirty-one".