115861861 has 2 divisors, whose sum is σ = 115861862. Its totient is φ = 115861860.

The previous prime is 115861853. The next prime is 115861871. The reversal of 115861861 is 168168511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112232836 + 3629025 = 10594^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 115861861 - 2³ = 115861853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115861861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115861831) 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, 57930930 + 57930931.

It is an arithmetic number, because the mean of its divisors is an integer number (57930931).

Almost surely, 2^115861861 is an apocalyptic number.

It is an amenable number.

115861861 is a deficient number, since it is larger than the sum of its proper divisors (1).

115861861 is an equidigital number, since it uses as much as digits as its factorization.

115861861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 37.

The square root of 115861861 is about 10763.9147618327. The cubic root of 115861861 is about 487.5062261751.

The spelling of 115861861 in words is "one hundred fifteen million, eight hundred sixty-one thousand, eight hundred sixty-one".