12501581 has 8 divisors (see below), whose sum is σ = 13495680. Its totient is φ = 11545072.

The previous prime is 12501527. The next prime is 12501583. The reversal of 12501581 is 18510521.

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-12501581 is a prime.

It is a super-2 number, since 2×12501581² = 312579054999122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8705 + ... + 10038.

It is an arithmetic number, because the mean of its divisors is an integer number (1686960).

Almost surely, 2^12501581 is an apocalyptic number.

It is an amenable number.

12501581 is a deficient number, since it is larger than the sum of its proper divisors (994099).

12501581 is a wasteful number, since it uses less digits than its factorization.

12501581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18795.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 12501581 is about 3535.7574860276. The cubic root of 12501581 is about 232.0892257374.

The spelling of 12501581 in words is "twelve million, five hundred one thousand, five hundred eighty-one".