1325878561 has 8 divisors (see below), whose sum is σ = 1516319360. Its totient is φ = 1135695168.

The previous prime is 1325878553. The next prime is 1325878573. The reversal of 1325878561 is 1658785231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1325878561 - 2³ = 1325878553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325878511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53181 + ... + 74026.

It is an arithmetic number, because the mean of its divisors is an integer number (189539920).

Almost surely, 2^1325878561 is an apocalyptic number.

It is an amenable number.

1325878561 is a deficient number, since it is larger than the sum of its proper divisors (190440799).

1325878561 is a wasteful number, since it uses less digits than its factorization.

1325878561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128703.

The product of its digits is 403200, while the sum is 46.

The square root of 1325878561 is about 36412.6154100471. The cubic root of 1325878561 is about 1098.5873218023.

It can be divided in two parts, 13258 and 78561, that added together give a palindrome (91819).

The spelling of 1325878561 in words is "one billion, three hundred twenty-five million, eight hundred seventy-eight thousand, five hundred sixty-one".