113819561 has 2 divisors, whose sum is σ = 113819562. Its totient is φ = 113819560.

The previous prime is 113819551. The next prime is 113819591. The reversal of 113819561 is 165918311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 609961 = 10640^2 + 781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113819561 is a prime.

It is equal to p_6509186 and since 113819561 and 6509186 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (113819521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56909780 + 56909781.

It is an arithmetic number, because the mean of its divisors is an integer number (56909781).

Almost surely, 2^113819561 is an apocalyptic number.

It is an amenable number.

113819561 is a deficient number, since it is larger than the sum of its proper divisors (1).

113819561 is an equidigital number, since it uses as much as digits as its factorization.

113819561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 113819561 is about 10668.6250754256. The cubic root of 113819561 is about 484.6248006885.

The spelling of 113819561 in words is "one hundred thirteen million, eight hundred nineteen thousand, five hundred sixty-one".