1113918781 has 4 divisors (see below), whose sum is σ = 1144024732. Its totient is φ = 1083812832.

The previous prime is 1113918769. The next prime is 1113918821. The reversal of 1113918781 is 1878193111.

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 979126681 + 134792100 = 31291^2 + 11610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1113918781 - 2⁹ = 1113918269 is a prime.

It is a super-2 number, since 2×1113918781² = 2481630101329051922, 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 (1113918581) 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, 15052920 + ... + 15052993.

It is an arithmetic number, because the mean of its divisors is an integer number (286006183).

Almost surely, 2^1113918781 is an apocalyptic number.

It is an amenable number.

1113918781 is a deficient number, since it is larger than the sum of its proper divisors (30105951).

1113918781 is an equidigital number, since it uses as much as digits as its factorization.

1113918781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30105950.

The product of its digits is 12096, while the sum is 40.

The square root of 1113918781 is about 33375.4218100686. The cubic root of 1113918781 is about 1036.6158431652.

The spelling of 1113918781 in words is "one billion, one hundred thirteen million, nine hundred eighteen thousand, seven hundred eighty-one".