1980830981 has 2 divisors, whose sum is σ = 1980830982. Its totient is φ = 1980830980.

The previous prime is 1980830977. The next prime is 1980831011. The reversal of 1980830981 is 1890380891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1063346881 + 917484100 = 32609^2 + 30290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980830981 - 2² = 1980830977 is a prime.

It is a super-2 number, since 2×1980830981² = 7847382750578844722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980830381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990415490 + 990415491.

It is an arithmetic number, because the mean of its divisors is an integer number (990415491).

Almost surely, 2^1980830981 is an apocalyptic number.

It is an amenable number.

1980830981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980830981 is an equidigital number, since it uses as much as digits as its factorization.

1980830981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 1980830981 is about 44506.5273976751. The cubic root of 1980830981 is about 1255.8828792317.

The spelling of 1980830981 in words is "one billion, nine hundred eighty million, eight hundred thirty thousand, nine hundred eighty-one".