194991969 has 16 divisors (see below), whose sum is σ = 271987200. Its totient is φ = 124096896.

The previous prime is 194991949. The next prime is 194991997. The reversal of 194991969 is 969199491.

It is a de Polignac number, because none of the positive numbers 2^k-194991969 is a prime.

It is a super-2 number, since 2×194991969² = 76043735948993922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (194991919) 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 15 ways as a sum of consecutive naturals, for example, 4849 + ... + 20334.

It is an arithmetic number, because the mean of its divisors is an integer number (16999200).

Almost surely, 2^194991969 is an apocalyptic number.

It is an amenable number.

194991969 is a deficient number, since it is larger than the sum of its proper divisors (76995231).

194991969 is a wasteful number, since it uses less digits than its factorization.

194991969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25304.

The product of its digits is 1417176, while the sum is 57.

The square root of 194991969 is about 13963.9524848805. The cubic root of 194991969 is about 579.8810388205.

The spelling of 194991969 in words is "one hundred ninety-four million, nine hundred ninety-one thousand, nine hundred sixty-nine".