2165631 has 8 divisors (see below), whose sum is σ = 3109680. Its totient is φ = 1332672.

The previous prime is 2165617. The next prime is 2165651. The reversal of 2165631 is 1365612.

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

It is not a de Polignac number, because 2165631 - 2⁵ = 2165599 is a prime.

It is a super-2 number, since 2×2165631² = 9379915256322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165651) 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, 27726 + ... + 27803.

It is an arithmetic number, because the mean of its divisors is an integer number (388710).

2^2165631 is an apocalyptic number.

2165631 is a deficient number, since it is larger than the sum of its proper divisors (944049).

2165631 is a wasteful number, since it uses less digits than its factorization.

2165631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55545.

The product of its digits is 1080, while the sum is 24.

The square root of 2165631 is about 1471.6083038635. The cubic root of 2165631 is about 129.3783137614.

The spelling of 2165631 in words is "two million, one hundred sixty-five thousand, six hundred thirty-one".