998705431 has 2 divisors, whose sum is σ = 998705432. Its totient is φ = 998705430.

The previous prime is 998705423. The next prime is 998705453. The reversal of 998705431 is 134507899.

It is a happy number.

998705431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998705431 - 2³ = 998705423 is a prime.

It is a super-2 number, since 2×998705431² = 1994825075817791522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998705231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499352715 + 499352716.

It is an arithmetic number, because the mean of its divisors is an integer number (499352716).

Almost surely, 2^998705431 is an apocalyptic number.

998705431 is a deficient number, since it is larger than the sum of its proper divisors (1).

998705431 is an equidigital number, since it uses as much as digits as its factorization.

998705431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 998705431 is about 31602.3010396395. The cubic root of 998705431 is about 999.5682906539.

The spelling of 998705431 in words is "nine hundred ninety-eight million, seven hundred five thousand, four hundred thirty-one".