1081409 has 4 divisors (see below), whose sum is σ = 1235904. Its totient is φ = 926916.

The previous prime is 1081403. The next prime is 1081417. The reversal of 1081409 is 9041801.

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 1081409 - 2⁸ = 1081153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081403) 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, 77237 + ... + 77250.

It is an arithmetic number, because the mean of its divisors is an integer number (308976).

2^1081409 is an apocalyptic number.

It is an amenable number.

1081409 is a deficient number, since it is larger than the sum of its proper divisors (154495).

1081409 is an equidigital number, since it uses as much as digits as its factorization.

1081409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154494.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1081409 is about 1039.9081690226. The cubic root of 1081409 is about 102.6431551172.

The spelling of 1081409 in words is "one million, eighty-one thousand, four hundred nine".