190289861 has 2 divisors, whose sum is σ = 190289862. Its totient is φ = 190289860.

The previous prime is 190289797. The next prime is 190289863. The reversal of 190289861 is 168982091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139381636 + 50908225 = 11806^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 190289861 - 2⁶ = 190289797 is a prime.

It is a Sophie Germain prime.

Together with 190289863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190289863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95144930 + 95144931.

It is an arithmetic number, because the mean of its divisors is an integer number (95144931).

Almost surely, 2^190289861 is an apocalyptic number.

It is an amenable number.

190289861 is a deficient number, since it is larger than the sum of its proper divisors (1).

190289861 is an equidigital number, since it uses as much as digits as its factorization.

190289861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 190289861 is about 13794.5591085761. The cubic root of 190289861 is about 575.1819069071.

The spelling of 190289861 in words is "one hundred ninety million, two hundred eighty-nine thousand, eight hundred sixty-one".