194291869 has 2 divisors, whose sum is σ = 194291870. Its totient is φ = 194291868.

The previous prime is 194291807. The next prime is 194291927. The reversal of 194291869 is 968192491.

It is a happy number.

194291869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194267844 + 24025 = 13938^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194291869 is a prime.

It is a super-2 number, since 2×194291869² = 75498660719026322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194291369) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97145934 + 97145935.

It is an arithmetic number, because the mean of its divisors is an integer number (97145935).

Almost surely, 2^194291869 is an apocalyptic number.

It is an amenable number.

194291869 is a deficient number, since it is larger than the sum of its proper divisors (1).

194291869 is an equidigital number, since it uses as much as digits as its factorization.

194291869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 194291869 is about 13938.8618258450. The cubic root of 194291869 is about 579.1862041221.

The spelling of 194291869 in words is "one hundred ninety-four million, two hundred ninety-one thousand, eight hundred sixty-nine".