1304681513 has 4 divisors (see below), whose sum is σ = 1304837520. Its totient is φ = 1304525508.

The previous prime is 1304681491. The next prime is 1304681537. The reversal of 1304681513 is 3151864031.

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: 3151864031 = 1877 ⋅1679203.

It is a cyclic number.

It is not a de Polignac number, because 1304681513 - 2⁶ = 1304681449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1304681513.

It is not an unprimeable number, because it can be changed into a prime (1304681563) 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, 64703 + ... + 82436.

It is an arithmetic number, because the mean of its divisors is an integer number (326209380).

Almost surely, 2^1304681513 is an apocalyptic number.

It is an amenable number.

1304681513 is a deficient number, since it is larger than the sum of its proper divisors (156007).

1304681513 is an equidigital number, since it uses as much as digits as its factorization.

1304681513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156006.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1304681513 is about 36120.3753164332. The cubic root of 1304681513 is about 1092.7014084419.

The spelling of 1304681513 in words is "one billion, three hundred four million, six hundred eighty-one thousand, five hundred thirteen".