190943561 has 2 divisors, whose sum is σ = 190943562. Its totient is φ = 190943560.

The previous prime is 190943531. The next prime is 190943573. The reversal of 190943561 is 165349091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144961600 + 45981961 = 12040^2 + 6781^2 .

It is an emirp because it is prime and its reverse (165349091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190943561 - 2⁶ = 190943497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (190943531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95471780 + 95471781.

It is an arithmetic number, because the mean of its divisors is an integer number (95471781).

Almost surely, 2^190943561 is an apocalyptic number.

It is an amenable number.

190943561 is a deficient number, since it is larger than the sum of its proper divisors (1).

190943561 is an equidigital number, since it uses as much as digits as its factorization.

190943561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 190943561 is about 13818.2329188648. The cubic root of 190943561 is about 575.8397921613.

The spelling of 190943561 in words is "one hundred ninety million, nine hundred forty-three thousand, five hundred sixty-one".