1311967 has 2 divisors, whose sum is σ = 1311968. Its totient is φ = 1311966.

The previous prime is 1311923. The next prime is 1311971. The reversal of 1311967 is 7691131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311967 is a prime.

1311967 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655983 + 655984.

It is an arithmetic number, because the mean of its divisors is an integer number (655984).

2^1311967 is an apocalyptic number.

1311967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311967 is an equidigital number, since it uses as much as digits as its factorization.

1311967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 28.

The square root of 1311967 is about 1145.4112798467. The cubic root of 1311967 is about 109.4731556416.

It can be divided in two parts, 1311 and 967, that added together give a triangular number (2278 = T₆₇).

The spelling of 1311967 in words is "one million, three hundred eleven thousand, nine hundred sixty-seven".