1321566671 has 2 divisors, whose sum is σ = 1321566672. Its totient is φ = 1321566670.

The previous prime is 1321566619. The next prime is 1321566677. The reversal of 1321566671 is 1766651231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321566671 - 2²² = 1317372367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321566677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660783335 + 660783336.

It is an arithmetic number, because the mean of its divisors is an integer number (660783336).

Almost surely, 2^1321566671 is an apocalyptic number.

1321566671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321566671 is an equidigital number, since it uses as much as digits as its factorization.

1321566671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 1321566671 is about 36353.3584555815. The cubic root of 1321566671 is about 1097.3951231155.

The spelling of 1321566671 in words is "one billion, three hundred twenty-one million, five hundred sixty-six thousand, six hundred seventy-one".