1325643815 has 4 divisors (see below), whose sum is σ = 1590772584. Its totient is φ = 1060515048.

The previous prime is 1325643797. The next prime is 1325643821. The reversal of 1325643815 is 5183465231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5183465231 = 7 ⋅740495033.

It is a cyclic number.

It is not a de Polignac number, because 1325643815 - 2⁶ = 1325643751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132564377 + ... + 132564386.

It is an arithmetic number, because the mean of its divisors is an integer number (397693146).

Almost surely, 2^1325643815 is an apocalyptic number.

1325643815 is a deficient number, since it is larger than the sum of its proper divisors (265128769).

1325643815 is an equidigital number, since it uses as much as digits as its factorization.

1325643815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265128768.

The product of its digits is 86400, while the sum is 38.

The square root of 1325643815 is about 36409.3918515539. The cubic root of 1325643815 is about 1098.5224832345.

The spelling of 1325643815 in words is "one billion, three hundred twenty-five million, six hundred forty-three thousand, eight hundred fifteen".