634661 has 8 divisors (see below), whose sum is σ = 690840. Its totient is φ = 580608.

The previous prime is 634651. The next prime is 634679. The reversal of 634661 is 166436.

It can be written as a sum of positive squares in 4 ways, for example, as 244036 + 390625 = 494^2 + 625^2 .

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 634661 - 2⁶ = 634597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634661.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (86355).

2⁶³⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

634661 is a deficient number, since it is larger than the sum of its proper divisors (56179).

634661 is a wasteful number, since it uses less digits than its factorization.

634661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its digits is 2592, while the sum is 26.

The square root of 634661 is about 796.6561366110. The cubic root of 634661 is about 85.9370821577.

The spelling of 634661 in words is "six hundred thirty-four thousand, six hundred sixty-one".