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622121 = 769809
BaseRepresentation
bin10010111111000101001
31011121101112
42113320221
5124401441
621200105
75200523
oct2277051
91147345
10622121
11395455
12260035
1318a226
14122a13
15c44eb
hex97e29

622121 has 4 divisors (see below), whose sum is σ = 623700. Its totient is φ = 620544.

The previous prime is 622109. The next prime is 622123. The reversal of 622121 is 121226.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 409600 + 212521 = 640^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 622121 - 210 = 621097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 622096 and 622105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622123) 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, 365 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (155925).

2622121 is an apocalyptic number.

It is an amenable number.

622121 is a deficient number, since it is larger than the sum of its proper divisors (1579).

622121 is an equidigital number, since it uses as much as digits as its factorization.

622121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578.

The product of its digits is 48, while the sum is 14.

The square root of 622121 is about 788.7464738431. The cubic root of 622121 is about 85.3673146861.

Adding to 622121 its reverse (121226), we get a palindrome (743347).

The spelling of 622121 in words is "six hundred twenty-two thousand, one hundred twenty-one".

Divisors: 1 769 809 622121