1319311691 has 2 divisors, whose sum is σ = 1319311692. Its totient is φ = 1319311690.

The previous prime is 1319311657. The next prime is 1319311723. The reversal of 1319311691 is 1961139131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1319311691 - 2¹⁰ = 1319310667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1319311891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659655845 + 659655846.

It is an arithmetic number, because the mean of its divisors is an integer number (659655846).

Almost surely, 2^1319311691 is an apocalyptic number.

1319311691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1319311691 is an equidigital number, since it uses as much as digits as its factorization.

1319311691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 35.

The square root of 1319311691 is about 36322.3304731401. The cubic root of 1319311691 is about 1096.7706085624.

The spelling of 1319311691 in words is "one billion, three hundred nineteen million, three hundred eleven thousand, six hundred ninety-one".