194142251 has 2 divisors, whose sum is σ = 194142252. Its totient is φ = 194142250.

The previous prime is 194142203. The next prime is 194142253. The reversal of 194142251 is 152241491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194142251 is a prime.

It is a Sophie Germain prime.

Together with 194142253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194142253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97071125 + 97071126.

It is an arithmetic number, because the mean of its divisors is an integer number (97071126).

Almost surely, 2^194142251 is an apocalyptic number.

194142251 is a deficient number, since it is larger than the sum of its proper divisors (1).

194142251 is an equidigital number, since it uses as much as digits as its factorization.

194142251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 194142251 is about 13933.4938547372. The cubic root of 194142251 is about 579.0374949742.

The spelling of 194142251 in words is "one hundred ninety-four million, one hundred forty-two thousand, two hundred fifty-one".