1291566 has 8 divisors (see below), whose sum is σ = 2583144. Its totient is φ = 430520.

The previous prime is 1291547. The next prime is 1291567. The reversal of 1291566 is 6651921.

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

1291566 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291567) 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, 107625 + ... + 107636.

It is an arithmetic number, because the mean of its divisors is an integer number (322893).

2^1291566 is an apocalyptic number.

1291566 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.

1291566 is a wasteful number, since it uses less digits than its factorization.

1291566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215266.

The product of its digits is 3240, while the sum is 30.

The square root of 1291566 is about 1136.4708531238. The cubic root of 1291566 is about 108.9027553415.

The spelling of 1291566 in words is "one million, two hundred ninety-one thousand, five hundred sixty-six".