1311031 has 2 divisors, whose sum is σ = 1311032. Its totient is φ = 1311030.

The previous prime is 1311029. The next prime is 1311043. The reversal of 1311031 is 1301131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311031 - 2¹ = 1311029 is a prime.

It is a super-2 number, since 2×1311031² = 3437604565922, which contains 22 as substring.

Together with 1311029, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1310999 and 1311017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655515 + 655516.

It is an arithmetic number, because the mean of its divisors is an integer number (655516).

2^1311031 is an apocalyptic number.

1311031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311031 is an equidigital number, since it uses as much as digits as its factorization.

1311031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 1311031 is about 1145.0026200843. The cubic root of 1311031 is about 109.4471155428.

Adding to 1311031 its reverse (1301131), we get a palindrome (2612162).

The spelling of 1311031 in words is "one million, three hundred eleven thousand, thirty-one".