1291565 has 16 divisors (see below), whose sum is σ = 1766016. Its totient is φ = 897600.

The previous prime is 1291547. The next prime is 1291567. The reversal of 1291565 is 5651921.

It is not a de Polignac number, because 1291565 - 2⁶ = 1291501 is a prime.

It is a Duffinian 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 (1291567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 755 + ... + 1775.

It is an arithmetic number, because the mean of its divisors is an integer number (110376).

2^1291565 is an apocalyptic number.

It is an amenable number.

1291565 is a deficient number, since it is larger than the sum of its proper divisors (474451).

1291565 is a wasteful number, since it uses less digits than its factorization.

1291565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060.

The product of its digits is 2700, while the sum is 29.

The square root of 1291565 is about 1136.4704131653. The cubic root of 1291565 is about 108.9027272353.

The spelling of 1291565 in words is "one million, two hundred ninety-one thousand, five hundred sixty-five".