634621 has 4 divisors (see below), whose sum is σ = 683452. Its totient is φ = 585792.

The previous prime is 634609. The next prime is 634643. The reversal of 634621 is 126436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 164025 + 470596 = 405^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 634621 - 2⁷ = 634493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634592 and 634601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634651) 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, 24396 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (170863).

2⁶³⁴⁶²¹ is an apocalyptic number.

It is an amenable number.

634621 is a deficient number, since it is larger than the sum of its proper divisors (48831).

634621 is a wasteful number, since it uses less digits than its factorization.

634621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48830.

The product of its digits is 864, while the sum is 22.

The square root of 634621 is about 796.6310312811. The cubic root of 634621 is about 85.9352767028.

The spelling of 634621 in words is "six hundred thirty-four thousand, six hundred twenty-one".