1312231 has 4 divisors (see below), whose sum is σ = 1342792. Its totient is φ = 1281672.

The previous prime is 1312229. The next prime is 1312237. The reversal of 1312231 is 1322131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1322131 = 59 ⋅22409.

It is a cyclic number.

It is not a de Polignac number, because 1312231 - 2¹ = 1312229 is a prime.

It is a super-2 number, since 2×1312231² = 3443900394722, which contains 22 as substring.

It is a Duffinian number.

1312231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312237) 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, 15216 + ... + 15301.

It is an arithmetic number, because the mean of its divisors is an integer number (335698).

2^1312231 is an apocalyptic number.

1312231 is a deficient number, since it is larger than the sum of its proper divisors (30561).

1312231 is an equidigital number, since it uses as much as digits as its factorization.

1312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30560.

The product of its digits is 36, while the sum is 13.

The square root of 1312231 is about 1145.5265164980. The cubic root of 1312231 is about 109.4804980455.

Adding to 1312231 its reverse (1322131), we get a palindrome (2634362).

The spelling of 1312231 in words is "one million, three hundred twelve thousand, two hundred thirty-one".