115125821 has 2 divisors, whose sum is σ = 115125822. Its totient is φ = 115125820.

The previous prime is 115125817. The next prime is 115125863. The reversal of 115125821 is 128521511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99720196 + 15405625 = 9986^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 115125821 - 2² = 115125817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115125811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57562910 + 57562911.

It is an arithmetic number, because the mean of its divisors is an integer number (57562911).

Almost surely, 2^115125821 is an apocalyptic number.

It is an amenable number.

115125821 is a deficient number, since it is larger than the sum of its proper divisors (1).

115125821 is an equidigital number, since it uses as much as digits as its factorization.

115125821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 26.

The square root of 115125821 is about 10729.6701254046. The cubic root of 115125821 is about 486.4716993368.

The spelling of 115125821 in words is "one hundred fifteen million, one hundred twenty-five thousand, eight hundred twenty-one".