194115421 has 2 divisors, whose sum is σ = 194115422. Its totient is φ = 194115420.

The previous prime is 194115391. The next prime is 194115433. The reversal of 194115421 is 124511491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192127321 + 1988100 = 13861^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 194115421 - 2⁷ = 194115293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194115421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194115451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97057710 + 97057711.

It is an arithmetic number, because the mean of its divisors is an integer number (97057711).

Almost surely, 2^194115421 is an apocalyptic number.

It is an amenable number.

194115421 is a deficient number, since it is larger than the sum of its proper divisors (1).

194115421 is an equidigital number, since it uses as much as digits as its factorization.

194115421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 194115421 is about 13932.5310335201. The cubic root of 194115421 is about 579.0108198745.

The spelling of 194115421 in words is "one hundred ninety-four million, one hundred fifteen thousand, four hundred twenty-one".