1321567361 has 2 divisors, whose sum is σ = 1321567362. Its totient is φ = 1321567360.

The previous prime is 1321567343. The next prime is 1321567393. The reversal of 1321567361 is 1637651231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1110155761 + 211411600 = 33319^2 + 14540^2 .

It is an emirp because it is prime and its reverse (1637651231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321567361 - 2¹⁴ = 1321550977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321567321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660783680 + 660783681.

It is an arithmetic number, because the mean of its divisors is an integer number (660783681).

Almost surely, 2^1321567361 is an apocalyptic number.

It is an amenable number.

1321567361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321567361 is an equidigital number, since it uses as much as digits as its factorization.

1321567361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 1321567361 is about 36353.3679457626. The cubic root of 1321567361 is about 1097.3953141016.

The spelling of 1321567361 in words is "one billion, three hundred twenty-one million, five hundred sixty-seven thousand, three hundred sixty-one".