2131566 has 8 divisors (see below), whose sum is σ = 4263144. Its totient is φ = 710520.

The previous prime is 2131559. The next prime is 2131567. The reversal of 2131566 is 6651312.

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

2131566 is an admirable number.

It is a super-2 number, since 2×2131566² = 9087147224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177625 + ... + 177636.

It is an arithmetic number, because the mean of its divisors is an integer number (532893).

2^2131566 is an apocalyptic number.

2131566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131566 is a wasteful number, since it uses less digits than its factorization.

2131566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355266.

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

The square root of 2131566 is about 1459.9883561180. The cubic root of 2131566 is about 128.6963593435.

Adding to 2131566 its reverse (6651312), we get a palindrome (8782878).

The spelling of 2131566 in words is "two million, one hundred thirty-one thousand, five hundred sixty-six".