254991791 has 2 divisors, whose sum is σ = 254991792. Its totient is φ = 254991790.

The previous prime is 254991727. The next prime is 254991797. The reversal of 254991791 is 197199452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 254991791 - 2⁶ = 254991727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254991797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127495895 + 127495896.

It is an arithmetic number, because the mean of its divisors is an integer number (127495896).

Almost surely, 2^254991791 is an apocalyptic number.

254991791 is a deficient number, since it is larger than the sum of its proper divisors (1).

254991791 is an equidigital number, since it uses as much as digits as its factorization.

254991791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 254991791 is about 15968.4623868424. The cubic root of 254991791 is about 634.1257657671.

The spelling of 254991791 in words is "two hundred fifty-four million, nine hundred ninety-one thousand, seven hundred ninety-one".