981432531 has 12 divisors (see below), whose sum is σ = 1470129752. Its totient is φ = 654288192.

The previous prime is 981432523. The next prime is 981432533. The reversal of 981432531 is 135234189.

981432531 is a `hidden beast` number, since 9 + 81 + 43 + 2 + 531 = 666.

It is not a de Polignac number, because 981432531 - 2³ = 981432523 is a prime.

It is a super-3 number, since 3×981432531³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981432533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2019166 + ... + 2019651.

Almost surely, 2^981432531 is an apocalyptic number.

981432531 is a deficient number, since it is larger than the sum of its proper divisors (488697221).

981432531 is an equidigital number, since it uses as much as digits as its factorization.

981432531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038832 (or 4038820 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 981432531 is about 31327.8235918169. The cubic root of 981432531 is about 993.7721379191.

The spelling of 981432531 in words is "nine hundred eighty-one million, four hundred thirty-two thousand, five hundred thirty-one".