2115232981 has 2 divisors, whose sum is σ = 2115232982. Its totient is φ = 2115232980.

The previous prime is 2115232967. The next prime is 2115232997. The reversal of 2115232981 is 1892325112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2115080100 + 152881 = 45990^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115232981 - 2²³ = 2106844373 is a prime.

It is a super-2 number, since 2×2115232981² = 8948421127820292722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115232921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057616490 + 1057616491.

It is an arithmetic number, because the mean of its divisors is an integer number (1057616491).

Almost surely, 2^2115232981 is an apocalyptic number.

It is an amenable number.

2115232981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115232981 is an equidigital number, since it uses as much as digits as its factorization.

2115232981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 2115232981 is about 45991.6620812947. The cubic root of 2115232981 is about 1283.6680634845.

The spelling of 2115232981 in words is "two billion, one hundred fifteen million, two hundred thirty-two thousand, nine hundred eighty-one".