194188861 has 2 divisors, whose sum is σ = 194188862. Its totient is φ = 194188860.

The previous prime is 194188853. The next prime is 194188871. The reversal of 194188861 is 168881491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159012100 + 35176761 = 12610^2 + 5931^2 .

It is an emirp because it is prime and its reverse (168881491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194188861 - 2³ = 194188853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194188871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97094430 + 97094431.

It is an arithmetic number, because the mean of its divisors is an integer number (97094431).

Almost surely, 2^194188861 is an apocalyptic number.

It is an amenable number.

194188861 is a deficient number, since it is larger than the sum of its proper divisors (1).

194188861 is an equidigital number, since it uses as much as digits as its factorization.

194188861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 46.

The square root of 194188861 is about 13935.1663427460. The cubic root of 194188861 is about 579.0838300334.

The spelling of 194188861 in words is "one hundred ninety-four million, one hundred eighty-eight thousand, eight hundred sixty-one".