119809561 has 2 divisors, whose sum is σ = 119809562. Its totient is φ = 119809560.

The previous prime is 119809549. The next prime is 119809609. The reversal of 119809561 is 165908911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98010000 + 21799561 = 9900^2 + 4669^2 .

It is a cyclic number.

It is not a de Polignac number, because 119809561 - 2⁷ = 119809433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (119809531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59904780 + 59904781.

It is an arithmetic number, because the mean of its divisors is an integer number (59904781).

Almost surely, 2^119809561 is an apocalyptic number.

It is an amenable number.

119809561 is a deficient number, since it is larger than the sum of its proper divisors (1).

119809561 is an equidigital number, since it uses as much as digits as its factorization.

119809561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 119809561 is about 10945.7553873636. The cubic root of 119809561 is about 492.9813528489.

The spelling of 119809561 in words is "one hundred nineteen million, eight hundred nine thousand, five hundred sixty-one".