1320749519 has 4 divisors (see below), whose sum is σ = 1321071696. Its totient is φ = 1320427344.

The previous prime is 1320749509. The next prime is 1320749543. The reversal of 1320749519 is 9159470231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1320749519 - 2²⁸ = 1052314063 is a prime.

It is a super-2 number, since 2×1320749519² = 3488758583877462722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320749509) 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 in 3 ways as a sum of consecutive naturals, for example, 154859 + ... + 163164.

It is an arithmetic number, because the mean of its divisors is an integer number (330267924).

Almost surely, 2^1320749519 is an apocalyptic number.

1320749519 is a deficient number, since it is larger than the sum of its proper divisors (322177).

1320749519 is an equidigital number, since it uses as much as digits as its factorization.

1320749519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322176.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 1320749519 is about 36342.1177010917. The cubic root of 1320749519 is about 1097.1688957832.

It can be divided in two parts, 13207 and 49519, that added together give a palindrome (62726).

The spelling of 1320749519 in words is "one billion, three hundred twenty million, seven hundred forty-nine thousand, five hundred nineteen".