989636531 has 4 divisors (see below), whose sum is σ = 1065762432. Its totient is φ = 913510632.

The previous prime is 989636509. The next prime is 989636563. The reversal of 989636531 is 135636989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989636531 is a prime.

It is a super-2 number, since 2×989636531² = 1958760926979427922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989636531.

It is not an unprimeable number, because it can be changed into a prime (989636731) 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, 38062931 + ... + 38062956.

It is an arithmetic number, because the mean of its divisors is an integer number (266440608).

Almost surely, 2^989636531 is an apocalyptic number.

989636531 is a deficient number, since it is larger than the sum of its proper divisors (76125901).

989636531 is a wasteful number, since it uses less digits than its factorization.

989636531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76125900.

The product of its digits is 1049760, while the sum is 50.

The square root of 989636531 is about 31458.4890133013. The cubic root of 989636531 is about 996.5335076492.

The spelling of 989636531 in words is "nine hundred eighty-nine million, six hundred thirty-six thousand, five hundred thirty-one".