1311749771 has 2 divisors, whose sum is σ = 1311749772. Its totient is φ = 1311749770.

The previous prime is 1311749753. The next prime is 1311749807. The reversal of 1311749771 is 1779471131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311749771 - 2²² = 1307555467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311749711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655874885 + 655874886.

It is an arithmetic number, because the mean of its divisors is an integer number (655874886).

Almost surely, 2^1311749771 is an apocalyptic number.

1311749771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311749771 is an equidigital number, since it uses as much as digits as its factorization.

1311749771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 41.

The square root of 1311749771 is about 36218.0862415451. The cubic root of 1311749771 is about 1094.6711330043.

The spelling of 1311749771 in words is "one billion, three hundred eleven million, seven hundred forty-nine thousand, seven hundred seventy-one".