998531457 has 24 divisors (see below), whose sum is σ = 1689540192. Its totient is φ = 518716800.

The previous prime is 998531419. The next prime is 998531467. The reversal of 998531457 is 754135899.

It is not a de Polignac number, because 998531457 - 2¹¹ = 998529409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998531467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307144 + ... + 310377.

It is an arithmetic number, because the mean of its divisors is an integer number (70397508).

Almost surely, 2^998531457 is an apocalyptic number.

It is an amenable number.

998531457 is a deficient number, since it is larger than the sum of its proper divisors (691008735).

998531457 is a wasteful number, since it uses less digits than its factorization.

998531457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617549 (or 617542 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 51.

The square root of 998531457 is about 31599.5483670258. The cubic root of 998531457 is about 999.5102458467.

The spelling of 998531457 in words is "nine hundred ninety-eight million, five hundred thirty-one thousand, four hundred fifty-seven".