981433581 has 8 divisors (see below), whose sum is σ = 1377450720. Its totient is φ = 619852752.

The previous prime is 981433577. The next prime is 981433597. The reversal of 981433581 is 185334189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 981433581 - 2² = 981433577 is a prime.

It is a super-2 number, since 2×981433581² = 1926423747828967122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981433501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8609010 + ... + 8609123.

It is an arithmetic number, because the mean of its divisors is an integer number (172181340).

Almost surely, 2^981433581 is an apocalyptic number.

It is an amenable number.

981433581 is a deficient number, since it is larger than the sum of its proper divisors (396017139).

981433581 is a wasteful number, since it uses less digits than its factorization.

981433581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218155.

The product of its digits is 103680, while the sum is 42.

The square root of 981433581 is about 31327.8403500784. The cubic root of 981433581 is about 993.7724923195.

The spelling of 981433581 in words is "nine hundred eighty-one million, four hundred thirty-three thousand, five hundred eighty-one".