1311023 has 16 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 1009536.

The previous prime is 1311001. The next prime is 1311029. The reversal of 1311023 is 3201131.

It is a cyclic number.

It is not a de Polignac number, because 1311023 - 2¹⁰ = 1309999 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1310995 and 1311013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311029) 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, 2498 + ... + 2976.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

2^1311023 is an apocalyptic number.

1311023 is a deficient number, since it is larger than the sum of its proper divisors (347857).

1311023 is a wasteful number, since it uses less digits than its factorization.

1311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1311023 is about 1144.9991266372. Note that the first 3 decimals coincide. The cubic root of 1311023 is about 109.4468929244.

Adding to 1311023 its reverse (3201131), we get a palindrome (4512154).

The spelling of 1311023 in words is "one million, three hundred eleven thousand, twenty-three".