194909491 has 4 divisors (see below), whose sum is σ = 222753712. Its totient is φ = 167065272.

The previous prime is 194909447. The next prime is 194909503.

194909491 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 194909491 - 2¹¹ = 194907443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194909191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13922100 + ... + 13922113.

It is an arithmetic number, because the mean of its divisors is an integer number (55688428).

Almost surely, 2^194909491 is an apocalyptic number.

194909491 is a deficient number, since it is larger than the sum of its proper divisors (27844221).

194909491 is an equidigital number, since it uses as much as digits as its factorization.

194909491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27844220.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 194909491 is about 13960.9989255784. The cubic root of 194909491 is about 579.7992676352.

The spelling of 194909491 in words is "one hundred ninety-four million, nine hundred nine thousand, four hundred ninety-one".