634219621 has 8 divisors (see below), whose sum is σ = 726462144. Its totient is φ = 542387040.

The previous prime is 634219603. The next prime is 634219631. The reversal of 634219621 is 126912436.

It is a happy number.

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 634219621 - 2²⁵ = 600665189 is a prime.

It is a super-2 number, since 2×634219621² = 804469055322767282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634219631) 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, 99160 + ... + 105361.

It is an arithmetic number, because the mean of its divisors is an integer number (90807768).

Almost surely, 2^634219621 is an apocalyptic number.

It is an amenable number.

634219621 is a deficient number, since it is larger than the sum of its proper divisors (92242523).

634219621 is a wasteful number, since it uses less digits than its factorization.

634219621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204971.

The product of its digits is 15552, while the sum is 34.

The square root of 634219621 is about 25183.7173784968. The cubic root of 634219621 is about 859.1715570890.

The spelling of 634219621 in words is "six hundred thirty-four million, two hundred nineteen thousand, six hundred twenty-one".