1291409 has 4 divisors (see below), whose sum is σ = 1475904. Its totient is φ = 1106916.

The previous prime is 1291391. The next prime is 1291421. The reversal of 1291409 is 9041921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1291409 - 2⁸ = 1291153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92237 + ... + 92250.

It is an arithmetic number, because the mean of its divisors is an integer number (368976).

2^1291409 is an apocalyptic number.

It is an amenable number.

1291409 is a deficient number, since it is larger than the sum of its proper divisors (184495).

1291409 is an equidigital number, since it uses as much as digits as its factorization.

1291409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184494.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1291409 is about 1136.4017775417. The cubic root of 1291409 is about 108.8983425007.

The spelling of 1291409 in words is "one million, two hundred ninety-one thousand, four hundred nine".