2991566 has 4 divisors (see below), whose sum is σ = 4487352. Its totient is φ = 1495782.

The previous prime is 2991559. The next prime is 2991589. The reversal of 2991566 is 6651992.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747890 + ... + 747893.

It is an arithmetic number, because the mean of its divisors is an integer number (1121838).

2^2991566 is an apocalyptic number.

2991566 is a deficient number, since it is larger than the sum of its proper divisors (1495786).

2991566 is a wasteful number, since it uses less digits than its factorization.

2991566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495785.

The product of its digits is 29160, while the sum is 38.

The square root of 2991566 is about 1729.6144078956. The cubic root of 2991566 is about 144.0896753677.

The spelling of 2991566 in words is "two million, nine hundred ninety-one thousand, five hundred sixty-six".