998564433 has 4 divisors (see below), whose sum is σ = 1331419248. Its totient is φ = 665709620.

The previous prime is 998564429. The next prime is 998564459. The reversal of 998564433 is 334465899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 334465899 = 3 ⋅111488633.

It is a cyclic number.

It is not a de Polignac number, because 998564433 - 2² = 998564429 is a prime.

It is a super-2 number, since 2×998564433² = 1994261853705222978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (998564933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166427403 + ... + 166427408.

It is an arithmetic number, because the mean of its divisors is an integer number (332854812).

Almost surely, 2^998564433 is an apocalyptic number.

It is an amenable number.

998564433 is a deficient number, since it is larger than the sum of its proper divisors (332854815).

998564433 is a wasteful number, since it uses less digits than its factorization.

998564433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332854814.

The product of its digits is 2799360, while the sum is 51.

The square root of 998564433 is about 31600.0701423272. The cubic root of 998564433 is about 999.5212485002.

The spelling of 998564433 in words is "nine hundred ninety-eight million, five hundred sixty-four thousand, four hundred thirty-three".