1881961316 has 24 divisors (see below), whose sum is σ = 3342809400. Its totient is φ = 926906112.

The previous prime is 1881961309. The next prime is 1881961331. The reversal of 1881961316 is 6131691881.

It can be written as a sum of positive squares in 4 ways, for example, as 803495716 + 1078465600 = 28346^2 + 32840^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252410 + ... + 259758.

It is an arithmetic number, because the mean of its divisors is an integer number (139283725).

Almost surely, 2^1881961316 is an apocalyptic number.

It is an amenable number.

1881961316 is a deficient number, since it is larger than the sum of its proper divisors (1460848084).

1881961316 is a wasteful number, since it uses less digits than its factorization.

1881961316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8303 (or 8301 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 1881961316 is about 43381.5780718037. The cubic root of 1881961316 is about 1234.6302041547.

The spelling of 1881961316 in words is "one billion, eight hundred eighty-one million, nine hundred sixty-one thousand, three hundred sixteen".