1980368691 has 32 divisors (see below), whose sum is σ = 3173879808. Its totient is φ = 1074453120.

The previous prime is 1980368683. The next prime is 1980368729. The reversal of 1980368691 is 1968630891.

It is not a de Polignac number, because 1980368691 - 2³ = 1980368683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1980368681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5805 + ... + 63201.

It is an arithmetic number, because the mean of its divisors is an integer number (99183744).

Almost surely, 2^1980368691 is an apocalyptic number.

1980368691 is a deficient number, since it is larger than the sum of its proper divisors (1193511117).

1980368691 is a wasteful number, since it uses less digits than its factorization.

1980368691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57491.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1980368691 is about 44501.3335867589. Note that the first 3 decimals coincide. The cubic root of 1980368691 is about 1255.7851715401.

The spelling of 1980368691 in words is "one billion, nine hundred eighty million, three hundred sixty-eight thousand, six hundred ninety-one".