113640781 has 4 divisors (see below), whose sum is σ = 113978332. Its totient is φ = 113303232.

The previous prime is 113640757. The next prime is 113640803. The reversal of 113640781 is 187046311.

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 16933225 + 96707556 = 4115^2 + 9834^2 .

It is a cyclic number.

It is not a de Polignac number, because 113640781 - 2¹⁵ = 113608013 is a prime.

It is a super-2 number, since 2×113640781² = 25828454212579922, 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 (113640721) 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, 168270 + ... + 168943.

It is an arithmetic number, because the mean of its divisors is an integer number (28494583).

Almost surely, 2^113640781 is an apocalyptic number.

It is an amenable number.

113640781 is a deficient number, since it is larger than the sum of its proper divisors (337551).

113640781 is an equidigital number, since it uses as much as digits as its factorization.

113640781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337550.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 113640781 is about 10660.2430084872. The cubic root of 113640781 is about 484.3709291978.

The spelling of 113640781 in words is "one hundred thirteen million, six hundred forty thousand, seven hundred eighty-one".