254066639 has 2 divisors, whose sum is σ = 254066640. Its totient is φ = 254066638.

The previous prime is 254066629. The next prime is 254066641. The reversal of 254066639 is 936660452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-254066639 is a prime.

Together with 254066641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 254066596 and 254066605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254066629) 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, 127033319 + 127033320.

It is an arithmetic number, because the mean of its divisors is an integer number (127033320).

Almost surely, 2^254066639 is an apocalyptic number.

254066639 is a deficient number, since it is larger than the sum of its proper divisors (1).

254066639 is an equidigital number, since it uses as much as digits as its factorization.

254066639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 254066639 is about 15939.4679647722. The cubic root of 254066639 is about 633.3579323471.

The spelling of 254066639 in words is "two hundred fifty-four million, sixty-six thousand, six hundred thirty-nine".