1325865581 has 16 divisors (see below), whose sum is σ = 1479254400. Its totient is φ = 1180988928.

The previous prime is 1325865577. The next prime is 1325865631. The reversal of 1325865581 is 1855685231.

It is not a de Polignac number, because 1325865581 - 2² = 1325865577 is a prime.

It is a super-2 number, since 2×1325865581² = 3515839077760935122, 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 (1325862581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502241 + ... + 504873.

It is an arithmetic number, because the mean of its divisors is an integer number (92453400).

Almost surely, 2^1325865581 is an apocalyptic number.

It is an amenable number.

1325865581 is a deficient number, since it is larger than the sum of its proper divisors (153388819).

1325865581 is a wasteful number, since it uses less digits than its factorization.

1325865581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228.

The product of its digits is 288000, while the sum is 44.

The square root of 1325865581 is about 36412.4371746798. The cubic root of 1325865581 is about 1098.5837368309.

The spelling of 1325865581 in words is "one billion, three hundred twenty-five million, eight hundred sixty-five thousand, five hundred eighty-one".