622681 has 4 divisors (see below), whose sum is σ = 627712. Its totient is φ = 617652.

The previous prime is 622669. The next prime is 622709. The reversal of 622681 is 186226.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186226 = 2 ⋅93113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-622681 is a prime.

It is a super-2 number, since 2×622681² = 775463255522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2325 + ... + 2578.

It is an arithmetic number, because the mean of its divisors is an integer number (156928).

2⁶²²⁶⁸¹ is an apocalyptic number.

It is an amenable number.

622681 is a deficient number, since it is larger than the sum of its proper divisors (5031).

622681 is a wasteful number, since it uses less digits than its factorization.

622681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030.

The product of its digits is 1152, while the sum is 25.

The square root of 622681 is about 789.1013876556. The cubic root of 622681 is about 85.3929213657.

The spelling of 622681 in words is "six hundred twenty-two thousand, six hundred eighty-one".