183145561 has 2 divisors, whose sum is σ = 183145562. Its totient is φ = 183145560.

The previous prime is 183145553. The next prime is 183145583. The reversal of 183145561 is 165541381.

183145561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183087961 + 57600 = 13531^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 183145561 - 2³ = 183145553 is a prime.

It is not a weakly prime, because it can be changed into another prime (183145661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91572780 + 91572781.

It is an arithmetic number, because the mean of its divisors is an integer number (91572781).

Almost surely, 2^183145561 is an apocalyptic number.

It is an amenable number.

183145561 is a deficient number, since it is larger than the sum of its proper divisors (1).

183145561 is an equidigital number, since it uses as much as digits as its factorization.

183145561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 34.

The square root of 183145561 is about 13533.1282784137. The cubic root of 183145561 is about 567.8916271866.

The spelling of 183145561 in words is "one hundred eighty-three million, one hundred forty-five thousand, five hundred sixty-one".