194481921 has 16 divisors (see below), whose sum is σ = 274978368. Its totient is φ = 121843200.

The previous prime is 194481907. The next prime is 194481943. The reversal of 194481921 is 129184491.

194481921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194481921 - 2²¹ = 192384769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194481921.

It is not an unprimeable number, because it can be changed into a prime (194481961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36306 + ... + 41316.

It is an arithmetic number, because the mean of its divisors is an integer number (17186148).

Almost surely, 2^194481921 is an apocalyptic number.

It is an amenable number.

194481921 is a deficient number, since it is larger than the sum of its proper divisors (80496447).

194481921 is a wasteful number, since it uses less digits than its factorization.

194481921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5792.

The product of its digits is 20736, while the sum is 39.

The square root of 194481921 is about 13945.6775023661. The cubic root of 194481921 is about 579.3749916156.

The spelling of 194481921 in words is "one hundred ninety-four million, four hundred eighty-one thousand, nine hundred twenty-one".