2151566 has 12 divisors (see below), whose sum is σ = 3304248. Its totient is φ = 1050732.

The previous prime is 2151563. The next prime is 2151593. The reversal of 2151566 is 6651512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4175 + ... + 4661.

It is an arithmetic number, because the mean of its divisors is an integer number (275354).

2^2151566 is an apocalyptic number.

2151566 is a deficient number, since it is larger than the sum of its proper divisors (1152682).

2151566 is an equidigital number, since it uses as much as digits as its factorization.

2151566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583 (or 536 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 2151566 is about 1466.8217342268. The cubic root of 2151566 is about 129.0976165565.

The spelling of 2151566 in words is "two million, one hundred fifty-one thousand, five hundred sixty-six".