1320131291 has 2 divisors, whose sum is σ = 1320131292. Its totient is φ = 1320131290.

The previous prime is 1320131287. The next prime is 1320131321. The reversal of 1320131291 is 1921310231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1921310231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320131291 - 2² = 1320131287 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660065645 + 660065646.

It is an arithmetic number, because the mean of its divisors is an integer number (660065646).

Almost surely, 2^1320131291 is an apocalyptic number.

1320131291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320131291 is an equidigital number, since it uses as much as digits as its factorization.

1320131291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1320131291 is about 36333.6110371650. The cubic root of 1320131291 is about 1096.9976782574.

The spelling of 1320131291 in words is "one billion, three hundred twenty million, one hundred thirty-one thousand, two hundred ninety-one".