1321297519 has 2 divisors, whose sum is σ = 1321297520. Its totient is φ = 1321297518.

The previous prime is 1321297517. The next prime is 1321297567. The reversal of 1321297519 is 9157921231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321297519 - 2¹ = 1321297517 is a prime.

It is a super-2 number, since 2×1321297519² = 3491654267431110722, which contains 22 as substring.

Together with 1321297517, 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 (1321297517) 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, 660648759 + 660648760.

It is an arithmetic number, because the mean of its divisors is an integer number (660648760).

Almost surely, 2^1321297519 is an apocalyptic number.

1321297519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321297519 is an equidigital number, since it uses as much as digits as its factorization.

1321297519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 1321297519 is about 36349.6563807693. The cubic root of 1321297519 is about 1097.3206190811.

The spelling of 1321297519 in words is "one billion, three hundred twenty-one million, two hundred ninety-seven thousand, five hundred nineteen".