634222561 has 8 divisors (see below), whose sum is σ = 725078720. Its totient is φ = 543429648.

The previous prime is 634222549. The next prime is 634222577. The reversal of 634222561 is 165222436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634222561 - 2⁹ = 634222049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634222541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8095 + ... + 36523.

It is an arithmetic number, because the mean of its divisors is an integer number (90634840).

Almost surely, 2^634222561 is an apocalyptic number.

It is an amenable number.

634222561 is a deficient number, since it is larger than the sum of its proper divisors (90856159).

634222561 is a wasteful number, since it uses less digits than its factorization.

634222561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31623.

The product of its digits is 17280, while the sum is 31.

The square root of 634222561 is about 25183.7757494781. The cubic root of 634222561 is about 859.1728846840.

Adding to 634222561 its reverse (165222436), we get a palindrome (799444997).

The spelling of 634222561 in words is "six hundred thirty-four million, two hundred twenty-two thousand, five hundred sixty-one".