194524921 has 2 divisors, whose sum is σ = 194524922. Its totient is φ = 194524920.

The previous prime is 194524901. The next prime is 194524973. The reversal of 194524921 is 129425491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162205696 + 32319225 = 12736^2 + 5685^2 .

It is a cyclic number.

It is not a de Polignac number, because 194524921 - 2¹¹ = 194522873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194524901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97262460 + 97262461.

It is an arithmetic number, because the mean of its divisors is an integer number (97262461).

Almost surely, 2^194524921 is an apocalyptic number.

It is an amenable number.

194524921 is a deficient number, since it is larger than the sum of its proper divisors (1).

194524921 is an equidigital number, since it uses as much as digits as its factorization.

194524921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 194524921 is about 13947.2191135007. The cubic root of 194524921 is about 579.4176884528.

The spelling of 194524921 in words is "one hundred ninety-four million, five hundred twenty-four thousand, nine hundred twenty-one".