1113931661 has 2 divisors, whose sum is σ = 1113931662. Its totient is φ = 1113931660.

The previous prime is 1113931633. The next prime is 1113931669. The reversal of 1113931661 is 1661393111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1077086761 + 36844900 = 32819^2 + 6070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1113931661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1113931669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556965830 + 556965831.

It is an arithmetic number, because the mean of its divisors is an integer number (556965831).

Almost surely, 2^1113931661 is an apocalyptic number.

It is an amenable number.

1113931661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1113931661 is an equidigital number, since it uses as much as digits as its factorization.

1113931661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 1113931661 is about 33375.6147658736. The cubic root of 1113931661 is about 1036.6198385375.

The spelling of 1113931661 in words is "one billion, one hundred thirteen million, nine hundred thirty-one thousand, six hundred sixty-one".