194288991 has 24 divisors (see below), whose sum is σ = 282352896. Its totient is φ = 118778400.

The previous prime is 194288987. The next prime is 194288993. The reversal of 194288991 is 199882491.

It is not a de Polignac number, because 194288991 - 2² = 194288987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194288993) 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 in 23 ways as a sum of consecutive naturals, for example, 81466 + ... + 83816.

It is an arithmetic number, because the mean of its divisors is an integer number (11764704).

Almost surely, 2^194288991 is an apocalyptic number.

194288991 is a deficient number, since it is larger than the sum of its proper divisors (88063905).

194288991 is a wasteful number, since it uses less digits than its factorization.

194288991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2530 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 194288991 is about 13938.7585889131. The cubic root of 194288991 is about 579.1833443248.

The spelling of 194288991 in words is "one hundred ninety-four million, two hundred eighty-eight thousand, nine hundred ninety-one".