12581957 has 4 divisors (see below), whose sum is σ = 12888876. Its totient is φ = 12275040.

The previous prime is 12581953. The next prime is 12581963. The reversal of 12581957 is 75918521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5997601 + 6584356 = 2449^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 12581957 - 2² = 12581953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12581957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153398 + ... + 153479.

It is an arithmetic number, because the mean of its divisors is an integer number (3222219).

Almost surely, 2^12581957 is an apocalyptic number.

It is an amenable number.

12581957 is a deficient number, since it is larger than the sum of its proper divisors (306919).

12581957 is an equidigital number, since it uses as much as digits as its factorization.

12581957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306918.

The product of its digits is 25200, while the sum is 38.

The square root of 12581957 is about 3547.1054396508. The cubic root of 12581957 is about 232.5855514354.

The spelling of 12581957 in words is "twelve million, five hundred eighty-one thousand, nine hundred fifty-seven".