1321312147 has 2 divisors, whose sum is σ = 1321312148. Its totient is φ = 1321312146.

The previous prime is 1321312141. The next prime is 1321312151. The reversal of 1321312147 is 7412131231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321312147 - 2²³ = 1312923539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321312141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660656073 + 660656074.

It is an arithmetic number, because the mean of its divisors is an integer number (660656074).

Almost surely, 2^1321312147 is an apocalyptic number.

1321312147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321312147 is an equidigital number, since it uses as much as digits as its factorization.

1321312147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1321312147 is about 36349.8575925684. The cubic root of 1321312147 is about 1097.3246685216.

Adding to 1321312147 its reverse (7412131231), we get a palindrome (8733443378).

The spelling of 1321312147 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, one hundred forty-seven".