1320260813 has 4 divisors (see below), whose sum is σ = 1322436480. Its totient is φ = 1318085148.

The previous prime is 1320260737. The next prime is 1320260827. The reversal of 1320260813 is 3180620231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3180620231 = 2251 ⋅1412981.

It is a cyclic number.

It is not a de Polignac number, because 1320260813 - 2¹⁶ = 1320195277 is a prime.

It is a super-2 number, since 2×1320260813² = 3486177228686841938, 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 (1320260413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1086923 + ... + 1088136.

It is an arithmetic number, because the mean of its divisors is an integer number (330609120).

Almost surely, 2^1320260813 is an apocalyptic number.

It is an amenable number.

1320260813 is a deficient number, since it is larger than the sum of its proper divisors (2175667).

1320260813 is an equidigital number, since it uses as much as digits as its factorization.

1320260813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175666.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1320260813 is about 36335.3933926688. The cubic root of 1320260813 is about 1097.0335536504.

The spelling of 1320260813 in words is "one billion, three hundred twenty million, two hundred sixty thousand, eight hundred thirteen".