998765431 has 2 divisors, whose sum is σ = 998765432. Its totient is φ = 998765430.

The previous prime is 998765407. The next prime is 998765441. The reversal of 998765431 is 134567899.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998765431 - 2⁹ = 998764919 is a prime.

It is a super-2 number, since 2×998765431² = 1995064772321231522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998765441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499382715 + 499382716.

It is an arithmetic number, because the mean of its divisors is an integer number (499382716).

Almost surely, 2^998765431 is an apocalyptic number.

998765431 is a deficient number, since it is larger than the sum of its proper divisors (1).

998765431 is an equidigital number, since it uses as much as digits as its factorization.

998765431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 998765431 is about 31603.2503233449. The cubic root of 998765431 is about 999.5883075326.

The spelling of 998765431 in words is "nine hundred ninety-eight million, seven hundred sixty-five thousand, four hundred thirty-one".