2161623 has 8 divisors (see below), whose sum is σ = 2892528. Its totient is φ = 1435904.

The previous prime is 2161613. The next prime is 2161633. The reversal of 2161623 is 3261612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2161613) and next prime (2161633).

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

It is a cyclic number.

It is not a de Polignac number, because 2161623 - 2⁵ = 2161591 is a prime.

It is a super-3 number, since 3×2161623³ = 30301289639493334101, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2161623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161613) 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, 186 + ... + 2087.

It is an arithmetic number, because the mean of its divisors is an integer number (361566).

2^2161623 is an apocalyptic number.

2161623 is a deficient number, since it is larger than the sum of its proper divisors (730905).

2161623 is a wasteful number, since it uses less digits than its factorization.

2161623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593.

The product of its digits is 432, while the sum is 21.

The square root of 2161623 is about 1470.2458978008. The cubic root of 2161623 is about 129.2984496620.

The spelling of 2161623 in words is "two million, one hundred sixty-one thousand, six hundred twenty-three".