1261566 has 24 divisors (see below), whose sum is σ = 2762760. Its totient is φ = 416016.

The previous prime is 1261549. The next prime is 1261567. The reversal of 1261566 is 6651621.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1641 + ... + 2283.

It is an arithmetic number, because the mean of its divisors is an integer number (115115).

2^1261566 is an apocalyptic number.

1261566 is an abundant number, since it is smaller than the sum of its proper divisors (1501194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261566 is a wasteful number, since it uses less digits than its factorization.

1261566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 757 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1261566 is about 1123.1945512688. The cubic root of 1261566 is about 108.0529575672.

The spelling of 1261566 in words is "one million, two hundred sixty-one thousand, five hundred sixty-six".