981531220 has 12 divisors (see below), whose sum is σ = 2061215604. Its totient is φ = 392612480.

The previous prime is 981531217. The next prime is 981531247. The reversal of 981531220 is 22135189.

It can be written as a sum of positive squares in 2 ways, for example, as 495240516 + 486290704 = 22254^2 + 22052^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24538261 + ... + 24538300.

It is an arithmetic number, because the mean of its divisors is an integer number (171767967).

Almost surely, 2^981531220 is an apocalyptic number.

It is an amenable number.

981531220 is an abundant number, since it is smaller than the sum of its proper divisors (1079684384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981531220 is a wasteful number, since it uses less digits than its factorization.

981531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49076570 (or 49076568 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 981531220 is about 31329.3986536607. The cubic root of 981531220 is about 993.8054467434.

The spelling of 981531220 in words is "nine hundred eighty-one million, five hundred thirty-one thousand, two hundred twenty".