622661 has 8 divisors (see below), whose sum is σ = 676704. Its totient is φ = 569520.

The previous prime is 622639. The next prime is 622663. The reversal of 622661 is 166226.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-622661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622663) 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, 2630 + ... + 2856.

It is an arithmetic number, because the mean of its divisors is an integer number (84588).

2⁶²²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

622661 is a deficient number, since it is larger than the sum of its proper divisors (54043).

622661 is a wasteful number, since it uses less digits than its factorization.

622661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451.

The product of its digits is 864, while the sum is 23.

The square root of 622661 is about 789.0887149111. The cubic root of 622661 is about 85.3920071059.

Adding to 622661 its reverse (166226), we get a palindrome (788887).

The spelling of 622661 in words is "six hundred twenty-two thousand, six hundred sixty-one".