981961580 has 24 divisors (see below), whose sum is σ = 2128640640. Its totient is φ = 380113920.

The previous prime is 981961579. The next prime is 981961583. The reversal of 981961580 is 85169189.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (981961583) 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, 791285 + ... + 792524.

It is an arithmetic number, because the mean of its divisors is an integer number (88693360).

Almost surely, 2^981961580 is an apocalyptic number.

It is an amenable number.

981961580 is an abundant number, since it is smaller than the sum of its proper divisors (1146679060).

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

981961580 is a wasteful number, since it uses less digits than its factorization.

981961580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583849 (or 1583847 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 981961580 is about 31336.2662102555. The cubic root of 981961580 is about 993.9506727637.

The spelling of 981961580 in words is "nine hundred eighty-one million, nine hundred sixty-one thousand, five hundred eighty".