1291791 has 16 divisors (see below), whose sum is σ = 1837440. Its totient is φ = 804960.

The previous prime is 1291783. The next prime is 1291793. The reversal of 1291791 is 1971921.

It is not a de Polignac number, because 1291791 - 2³ = 1291783 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291793) 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, 7381 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (114840).

2^1291791 is an apocalyptic number.

1291791 is a deficient number, since it is larger than the sum of its proper divisors (545649).

1291791 is a wasteful number, since it uses less digits than its factorization.

1291791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 1134, while the sum is 30.

The square root of 1291791 is about 1136.5698394731. The cubic root of 1291791 is about 108.9090788529.

The spelling of 1291791 in words is "one million, two hundred ninety-one thousand, seven hundred ninety-one".