194174921 has 2 divisors, whose sum is σ = 194174922. Its totient is φ = 194174920.

The previous prime is 194174899. The next prime is 194174941. The reversal of 194174921 is 129471491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164352400 + 29822521 = 12820^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 194174921 - 2⁶ = 194174857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194174941) 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 as a sum of consecutive naturals, namely, 97087460 + 97087461.

It is an arithmetic number, because the mean of its divisors is an integer number (97087461).

Almost surely, 2^194174921 is an apocalyptic number.

It is an amenable number.

194174921 is a deficient number, since it is larger than the sum of its proper divisors (1).

194174921 is an equidigital number, since it uses as much as digits as its factorization.

194174921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 194174921 is about 13934.6661603355. Note that the first 3 decimals coincide. The cubic root of 194174921 is about 579.0699730392.

The spelling of 194174921 in words is "one hundred ninety-four million, one hundred seventy-four thousand, nine hundred twenty-one".