1311406531 has 2 divisors, whose sum is σ = 1311406532. Its totient is φ = 1311406530.

The previous prime is 1311406513. The next prime is 1311406541. The reversal of 1311406531 is 1356041131.

Together with previous prime (1311406513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311406531 is a prime.

It is a super-2 number, since 2×1311406531² = 3439574179098907922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311406496 and 1311406505.

It is not a weakly prime, because it can be changed into another prime (1311406541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655703265 + 655703266.

It is an arithmetic number, because the mean of its divisors is an integer number (655703266).

Almost surely, 2^1311406531 is an apocalyptic number.

1311406531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311406531 is an equidigital number, since it uses as much as digits as its factorization.

1311406531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1311406531 is about 36213.3474150071. The cubic root of 1311406531 is about 1094.5756453574.

Adding to 1311406531 its reverse (1356041131), we get a palindrome (2667447662).

The spelling of 1311406531 in words is "one billion, three hundred eleven million, four hundred six thousand, five hundred thirty-one".