1291365 has 12 divisors (see below), whose sum is σ = 2238444. Its totient is φ = 688704.

The previous prime is 1291357. The next prime is 1291369. The reversal of 1291365 is 5631921.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 1028196 = 513^2 + 1014^2 .

It is not a de Polignac number, because 1291365 - 2³ = 1291357 is a prime.

It is a Curzon number.

1291365 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14304 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (186537).

2^1291365 is an apocalyptic number.

1291365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291365 is a deficient number, since it is larger than the sum of its proper divisors (947079).

1291365 is a wasteful number, since it uses less digits than its factorization.

1291365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28708 (or 28705 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1291365 is about 1136.3824180266. The cubic root of 1291365 is about 108.8971057168.

The spelling of 1291365 in words is "one million, two hundred ninety-one thousand, three hundred sixty-five".