634261643 has 4 divisors (see below), whose sum is σ = 654721728. Its totient is φ = 613801560.

The previous prime is 634261633. The next prime is 634261651. The reversal of 634261643 is 346162436.

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 634261643 - 2⁴ = 634261627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634261603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10229996 + ... + 10230057.

It is an arithmetic number, because the mean of its divisors is an integer number (163680432).

Almost surely, 2^634261643 is an apocalyptic number.

634261643 is a deficient number, since it is larger than the sum of its proper divisors (20460085).

634261643 is a wasteful number, since it uses less digits than its factorization.

634261643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460084.

The product of its digits is 62208, while the sum is 35.

The square root of 634261643 is about 25184.5516735955. The cubic root of 634261643 is about 859.1905322771.

The spelling of 634261643 in words is "six hundred thirty-four million, two hundred sixty-one thousand, six hundred forty-three".