115555301921 has 2 divisors, whose sum is σ = 115555301922. Its totient is φ = 115555301920.

The previous prime is 115555301861. The next prime is 115555301963. The reversal of 115555301921 is 129103555511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66597544225 + 48957757696 = 258065^2 + 221264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115555301921 is a prime.

It is not a weakly prime, because it can be changed into another prime (115555307921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57777650960 + 57777650961.

It is an arithmetic number, because the mean of its divisors is an integer number (57777650961).

Almost surely, 2^115555301921 is an apocalyptic number.

It is an amenable number.

115555301921 is a deficient number, since it is larger than the sum of its proper divisors (1).

115555301921 is an equidigital number, since it uses as much as digits as its factorization.

115555301921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33750, while the sum is 38.

The spelling of 115555301921 in words is "one hundred fifteen billion, five hundred fifty-five million, three hundred one thousand, nine hundred twenty-one".