1622161 has 4 divisors (see below), whose sum is σ = 1638324. Its totient is φ = 1606000.

The previous prime is 1622149. The next prime is 1622189. The reversal of 1622161 is 1612261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 891136 = 855^2 + 944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1622161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1622141) 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, 7930 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (409581).

2^1622161 is an apocalyptic number.

It is an amenable number.

1622161 is a deficient number, since it is larger than the sum of its proper divisors (16163).

1622161 is a wasteful number, since it uses less digits than its factorization.

1622161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16162.

The product of its digits is 144, while the sum is 19.

The square root of 1622161 is about 1273.6408441943. The cubic root of 1622161 is about 117.4982284326.

The spelling of 1622161 in words is "one million, six hundred twenty-two thousand, one hundred sixty-one".