113861809 has 2 divisors, whose sum is σ = 113861810. Its totient is φ = 113861808.

The previous prime is 113861789. The next prime is 113861821. The reversal of 113861809 is 908168311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94148209 + 19713600 = 9703^2 + 4440^2 .

It is an emirp because it is prime and its reverse (908168311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113861809 - 2¹³ = 113853617 is a prime.

It is not a weakly prime, because it can be changed into another prime (113861849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56930904 + 56930905.

It is an arithmetic number, because the mean of its divisors is an integer number (56930905).

Almost surely, 2^113861809 is an apocalyptic number.

It is an amenable number.

113861809 is a deficient number, since it is larger than the sum of its proper divisors (1).

113861809 is an equidigital number, since it uses as much as digits as its factorization.

113861809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 113861809 is about 10670.6049031908. The cubic root of 113861809 is about 484.6847549286.

The spelling of 113861809 in words is "one hundred thirteen million, eight hundred sixty-one thousand, eight hundred nine".