254217191 has 2 divisors, whose sum is σ = 254217192. Its totient is φ = 254217190.

The previous prime is 254217157. The next prime is 254217193. The reversal of 254217191 is 191712452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-254217191 is a prime.

Together with 254217193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254217193) 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, 127108595 + 127108596.

It is an arithmetic number, because the mean of its divisors is an integer number (127108596).

Almost surely, 2^254217191 is an apocalyptic number.

254217191 is a deficient number, since it is larger than the sum of its proper divisors (1).

254217191 is an equidigital number, since it uses as much as digits as its factorization.

254217191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 254217191 is about 15944.1898822110. The cubic root of 254217191 is about 633.4830103916.

The spelling of 254217191 in words is "two hundred fifty-four million, two hundred seventeen thousand, one hundred ninety-one".