12291566 has 12 divisors (see below), whose sum is σ = 21093768. Its totient is φ = 5262192.

The previous prime is 12291557. The next prime is 12291577. The reversal of 12291566 is 66519221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12650 + ... + 13586.

It is an arithmetic number, because the mean of its divisors is an integer number (1757814).

Almost surely, 2^12291566 is an apocalyptic number.

12291566 is a deficient number, since it is larger than the sum of its proper divisors (8802202).

12291566 is an frugal number, since it uses more digits than its factorization.

12291566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 946 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 12291566 is about 3505.9329714072. The cubic root of 12291566 is about 230.7822514078.

The spelling of 12291566 in words is "twelve million, two hundred ninety-one thousand, five hundred sixty-six".