1309081 has 4 divisors (see below), whose sum is σ = 1378000. Its totient is φ = 1240164.

The previous prime is 1309079. The next prime is 1309093. The reversal of 1309081 is 1809031.

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 1309081 - 2¹ = 1309079 is a prime.

It is a super-2 number, since 2×1309081² = 3427386129122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34431 + ... + 34468.

It is an arithmetic number, because the mean of its divisors is an integer number (344500).

2^1309081 is an apocalyptic number.

It is an amenable number.

1309081 is a deficient number, since it is larger than the sum of its proper divisors (68919).

1309081 is an equidigital number, since it uses as much as digits as its factorization.

1309081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68918.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1309081 is about 1144.1507767773. The cubic root of 1309081 is about 109.3928255029.

Multiplying 1309081 by its sum of digits (22), we get a palindrome (28799782).

The spelling of 1309081 in words is "one million, three hundred nine thousand, eighty-one".