634228391 has 2 divisors, whose sum is σ = 634228392. Its totient is φ = 634228390.

The previous prime is 634228337. The next prime is 634228403. The reversal of 634228391 is 193822436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634228391 - 2⁶ = 634228327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634228691) 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, 317114195 + 317114196.

It is an arithmetic number, because the mean of its divisors is an integer number (317114196).

Almost surely, 2^634228391 is an apocalyptic number.

634228391 is a deficient number, since it is larger than the sum of its proper divisors (1).

634228391 is an equidigital number, since it uses as much as digits as its factorization.

634228391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 634228391 is about 25183.8914983368. The cubic root of 634228391 is about 859.1755172838.

The spelling of 634228391 in words is "six hundred thirty-four million, two hundred twenty-eight thousand, three hundred ninety-one".