115127791981 has 2 divisors, whose sum is σ = 115127791982. Its totient is φ = 115127791980.

The previous prime is 115127791967. The next prime is 115127791991. The reversal of 115127791981 is 189197721511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68452349956 + 46675442025 = 261634^2 + 216045^2 .

It is a cyclic number.

It is not a de Polignac number, because 115127791981 - 2¹⁵ = 115127759213 is a prime.

It is a super-2 number, since 2×115127791981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115127791991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57563895990 + 57563895991.

It is an arithmetic number, because the mean of its divisors is an integer number (57563895991).

Almost surely, 2^115127791981 is an apocalyptic number.

It is an amenable number.

115127791981 is a deficient number, since it is larger than the sum of its proper divisors (1).

115127791981 is an equidigital number, since it uses as much as digits as its factorization.

115127791981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 52.

The spelling of 115127791981 in words is "one hundred fifteen billion, one hundred twenty-seven million, seven hundred ninety-one thousand, nine hundred eighty-one".