12645581 has 8 divisors (see below), whose sum is σ = 13747104. Its totient is φ = 11562480.

The previous prime is 12645547. The next prime is 12645623. The reversal of 12645581 is 18554621.

12645581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12645581 is a prime.

It is a super-2 number, since 2×12645581² = 319821437655122, 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 (12647581) 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, 3155 + ... + 5936.

It is an arithmetic number, because the mean of its divisors is an integer number (1718388).

Almost surely, 2^12645581 is an apocalyptic number.

It is an amenable number.

12645581 is a deficient number, since it is larger than the sum of its proper divisors (1101523).

12645581 is a wasteful number, since it uses less digits than its factorization.

12645581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9211.

The product of its digits is 9600, while the sum is 32.

The square root of 12645581 is about 3556.0625697532. The cubic root of 12645581 is about 232.9769359550.

The spelling of 12645581 in words is "twelve million, six hundred forty-five thousand, five hundred eighty-one".