1309331 has 4 divisors (see below), whose sum is σ = 1321032. Its totient is φ = 1297632.

The previous prime is 1309313. The next prime is 1309333. The reversal of 1309331 is 1339031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1309331 - 2¹⁴ = 1292947 is a prime.

It is a super-2 number, since 2×1309331² = 3428695335122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309333) 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, 5681 + ... + 5906.

It is an arithmetic number, because the mean of its divisors is an integer number (330258).

2^1309331 is an apocalyptic number.

1309331 is a deficient number, since it is larger than the sum of its proper divisors (11701).

1309331 is a wasteful number, since it uses less digits than its factorization.

1309331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11700.

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 1309331 is about 1144.2600228969. The cubic root of 1309331 is about 109.3997887760.

The spelling of 1309331 in words is "one million, three hundred nine thousand, three hundred thirty-one".