113509903 has 4 divisors (see below), whose sum is σ = 122241448. Its totient is φ = 104778360.

The previous prime is 113509897. The next prime is 113509919. The reversal of 113509903 is 309905311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113509903 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 (113509603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4365753 + ... + 4365778.

It is an arithmetic number, because the mean of its divisors is an integer number (30560362).

Almost surely, 2^113509903 is an apocalyptic number.

113509903 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

113509903 is a deficient number, since it is larger than the sum of its proper divisors (8731545).

113509903 is an equidigital number, since it uses as much as digits as its factorization.

113509903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8731544.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 113509903 is about 10654.1026370127. The cubic root of 113509903 is about 484.1849107343.

The spelling of 113509903 in words is "one hundred thirteen million, five hundred nine thousand, nine hundred three".