115432781 has 4 divisors (see below), whose sum is σ = 117610812. Its totient is φ = 113254752.

The previous prime is 115432763. The next prime is 115432817. The reversal of 115432781 is 187234511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37393225 + 78039556 = 6115^2 + 8834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115432781 is a prime.

It is a super-2 number, since 2×115432781² = 26649453858787922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115432481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088936 + ... + 1089041.

It is an arithmetic number, because the mean of its divisors is an integer number (29402703).

Almost surely, 2^115432781 is an apocalyptic number.

It is an amenable number.

115432781 is a deficient number, since it is larger than the sum of its proper divisors (2178031).

115432781 is an equidigital number, since it uses as much as digits as its factorization.

115432781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178030.

The product of its digits is 6720, while the sum is 32.

The square root of 115432781 is about 10743.9648640527. The cubic root of 115432781 is about 486.9036755016.

The spelling of 115432781 in words is "one hundred fifteen million, four hundred thirty-two thousand, seven hundred eighty-one".