194290091 has 2 divisors, whose sum is σ = 194290092. Its totient is φ = 194290090.

The previous prime is 194290087. The next prime is 194290099. The reversal of 194290091 is 190092491.

194290091 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 is a cyclic number.

It is not a de Polignac number, because 194290091 - 2² = 194290087 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194290099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97145045 + 97145046.

It is an arithmetic number, because the mean of its divisors is an integer number (97145046).

Almost surely, 2^194290091 is an apocalyptic number.

194290091 is a deficient number, since it is larger than the sum of its proper divisors (1).

194290091 is an equidigital number, since it uses as much as digits as its factorization.

194290091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 194290091 is about 13938.7980471775. The cubic root of 194290091 is about 579.1844373709.

The spelling of 194290091 in words is "one hundred ninety-four million, two hundred ninety thousand, ninety-one".