113505661 has 2 divisors, whose sum is σ = 113505662. Its totient is φ = 113505660.

The previous prime is 113505659. The next prime is 113505697. The reversal of 113505661 is 166505311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88003161 + 25502500 = 9381^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 113505661 - 2¹ = 113505659 is a prime.

Together with 113505659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113505631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56752830 + 56752831.

It is an arithmetic number, because the mean of its divisors is an integer number (56752831).

Almost surely, 2^113505661 is an apocalyptic number.

It is an amenable number.

113505661 is a deficient number, since it is larger than the sum of its proper divisors (1).

113505661 is an equidigital number, since it uses as much as digits as its factorization.

113505661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 113505661 is about 10653.9035569128. The cubic root of 113505661 is about 484.1788791373.

The spelling of 113505661 in words is "one hundred thirteen million, five hundred five thousand, six hundred sixty-one".