1981579610 has 24 divisors (see below), whose sum is σ = 3655992348. Its totient is φ = 773292800.

The previous prime is 1981579601. The next prime is 1981579631. The reversal of 1981579610 is 169751891.

It can be written as a sum of positive squares in 6 ways, for example, as 338817649 + 1642761961 = 18407^2 + 40531^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42131 + ... + 75750.

Almost surely, 2^1981579610 is an apocalyptic number.

1981579610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981579610 is a deficient number, since it is larger than the sum of its proper divisors (1674412738).

1981579610 is a wasteful number, since it uses less digits than its factorization.

1981579610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117970 (or 117929 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1981579610 is about 44514.9369313268. The cubic root of 1981579610 is about 1256.0410741061.

The spelling of 1981579610 in words is "one billion, nine hundred eighty-one million, five hundred seventy-nine thousand, six hundred ten".