634228891 has 4 divisors (see below), whose sum is σ = 642917032. Its totient is φ = 625540752.

The previous prime is 634228807. The next prime is 634228909. The reversal of 634228891 is 198822436.

634228891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 634228891 - 2¹¹ = 634226843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634228391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4343961 + ... + 4344106.

It is an arithmetic number, because the mean of its divisors is an integer number (160729258).

Almost surely, 2^634228891 is an apocalyptic number.

634228891 is a deficient number, since it is larger than the sum of its proper divisors (8688141).

634228891 is an equidigital number, since it uses as much as digits as its factorization.

634228891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8688140.

The product of its digits is 165888, while the sum is 43.

The square root of 634228891 is about 25183.9014253153. The cubic root of 634228891 is about 859.1757430635.

The spelling of 634228891 in words is "six hundred thirty-four million, two hundred twenty-eight thousand, eight hundred ninety-one".