115861813 has 4 divisors (see below), whose sum is σ = 116359308. Its totient is φ = 115364320.

The previous prime is 115861793. The next prime is 115861819. The reversal of 115861813 is 318168511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318168511 = 239 ⋅1331249.

It can be written as a sum of positive squares in 2 ways, for example, as 64352484 + 51509329 = 8022^2 + 7177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115861813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115861819) 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 in 3 ways as a sum of consecutive naturals, for example, 248398 + ... + 248863.

It is an arithmetic number, because the mean of its divisors is an integer number (29089827).

Almost surely, 2^115861813 is an apocalyptic number.

It is an amenable number.

115861813 is a deficient number, since it is larger than the sum of its proper divisors (497495).

115861813 is an equidigital number, since it uses as much as digits as its factorization.

115861813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497494.

The product of its digits is 5760, while the sum is 34.

The square root of 115861813 is about 10763.9125321604. The cubic root of 115861813 is about 487.5061588527.

The spelling of 115861813 in words is "one hundred fifteen million, eight hundred sixty-one thousand, eight hundred thirteen".