1291329 has 24 divisors (see below), whose sum is σ = 2078880. Its totient is φ = 791856.

The previous prime is 1291327. The next prime is 1291343. The reversal of 1291329 is 9231921.

It is not a de Polignac number, because 1291329 - 2¹ = 1291327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1291321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4422 + ... + 4704.

It is an arithmetic number, because the mean of its divisors is an integer number (86620).

2^1291329 is an apocalyptic number.

It is an amenable number.

1291329 is a deficient number, since it is larger than the sum of its proper divisors (787551).

1291329 is a wasteful number, since it uses less digits than its factorization.

1291329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 299 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1291329 is about 1136.3665781780. The cubic root of 1291329 is about 108.8960937818.

The spelling of 1291329 in words is "one million, two hundred ninety-one thousand, three hundred twenty-nine".