2129566 has 4 divisors (see below), whose sum is σ = 3194352. Its totient is φ = 1064782.

The previous prime is 2129551. The next prime is 2129579. The reversal of 2129566 is 6659212.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532390 + ... + 532393.

It is an arithmetic number, because the mean of its divisors is an integer number (798588).

2^2129566 is an apocalyptic number.

2129566 is a deficient number, since it is larger than the sum of its proper divisors (1064786).

2129566 is a wasteful number, since it uses less digits than its factorization.

2129566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064785.

The product of its digits is 6480, while the sum is 31.

The square root of 2129566 is about 1459.3032584079. The cubic root of 2129566 is about 128.6560957904.

The spelling of 2129566 in words is "two million, one hundred twenty-nine thousand, five hundred sixty-six".