1321572271 has 2 divisors, whose sum is σ = 1321572272. Its totient is φ = 1321572270.

The previous prime is 1321572269. The next prime is 1321572293. The reversal of 1321572271 is 1722751231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1722751231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321572271 - 2¹ = 1321572269 is a prime.

Together with 1321572269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321572221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660786135 + 660786136.

It is an arithmetic number, because the mean of its divisors is an integer number (660786136).

Almost surely, 2^1321572271 is an apocalyptic number.

1321572271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321572271 is an equidigital number, since it uses as much as digits as its factorization.

1321572271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 31.

The square root of 1321572271 is about 36353.4354772695. The cubic root of 1321572271 is about 1097.3966731455.

The spelling of 1321572271 in words is "one billion, three hundred twenty-one million, five hundred seventy-two thousand, two hundred seventy-one".