1320591451 has 2 divisors, whose sum is σ = 1320591452. Its totient is φ = 1320591450.

The previous prime is 1320591449. The next prime is 1320591469. The reversal of 1320591451 is 1541950231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320591451 - 2¹ = 1320591449 is a prime.

Together with 1320591449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1320591421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660295725 + 660295726.

It is an arithmetic number, because the mean of its divisors is an integer number (660295726).

Almost surely, 2^1320591451 is an apocalyptic number.

1320591451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320591451 is an equidigital number, since it uses as much as digits as its factorization.

1320591451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1320591451 is about 36339.9429140994. The cubic root of 1320591451 is about 1097.1251241193.

The spelling of 1320591451 in words is "one billion, three hundred twenty million, five hundred ninety-one thousand, four hundred fifty-one".