621169 has 4 divisors (see below), whose sum is σ = 623844. Its totient is φ = 618496.

The previous prime is 621143. The next prime is 621217. The reversal of 621169 is 961126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 961126 = 2 ⋅480563.

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 12769 = 780^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 621169 - 2⁹ = 620657 is a prime.

It is a super-2 number, since 2×621169² = 771701853122, which contains 22 as substring.

It is a Duffinian number.

621169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (621139) 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 3 ways as a sum of consecutive naturals, for example, 952 + ... + 1465.

It is an arithmetic number, because the mean of its divisors is an integer number (155961).

2⁶²¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

621169 is a deficient number, since it is larger than the sum of its proper divisors (2675).

621169 is a wasteful number, since it uses less digits than its factorization.

621169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674.

The product of its digits is 648, while the sum is 25.

The square root of 621169 is about 788.1427535669. The cubic root of 621169 is about 85.3237480417.

The spelling of 621169 in words is "six hundred twenty-one thousand, one hundred sixty-nine".