116011561 has 2 divisors, whose sum is σ = 116011562. Its totient is φ = 116011560.

The previous prime is 116011537. The next prime is 116011601. The reversal of 116011561 is 165110611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66520336 + 49491225 = 8156^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 116011561 - 2¹⁷ = 115880489 is a prime.

It is not a weakly prime, because it can be changed into another prime (116011261) 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, 58005780 + 58005781.

It is an arithmetic number, because the mean of its divisors is an integer number (58005781).

Almost surely, 2^116011561 is an apocalyptic number.

It is an amenable number.

116011561 is a deficient number, since it is larger than the sum of its proper divisors (1).

116011561 is an equidigital number, since it uses as much as digits as its factorization.

116011561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 116011561 is about 10770.8663068483. The cubic root of 116011561 is about 487.7160975763.

It can be divided in two parts, 1160 and 11561, that added together give a palindrome (12721).

The spelling of 116011561 in words is "one hundred sixteen million, eleven thousand, five hundred sixty-one".