1321831207 has 2 divisors, whose sum is σ = 1321831208. Its totient is φ = 1321831206.

The previous prime is 1321831187. The next prime is 1321831213. The reversal of 1321831207 is 7021381231.

It is a strong prime.

It is an emirp because it is prime and its reverse (7021381231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321831207 - 2⁷ = 1321831079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321831297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660915603 + 660915604.

It is an arithmetic number, because the mean of its divisors is an integer number (660915604).

Almost surely, 2^1321831207 is an apocalyptic number.

1321831207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321831207 is an equidigital number, since it uses as much as digits as its factorization.

1321831207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1321831207 is about 36356.9966718925. The cubic root of 1321831207 is about 1097.4683395374.

The spelling of 1321831207 in words is "one billion, three hundred twenty-one million, eight hundred thirty-one thousand, two hundred seven".