12578981 has 4 divisors (see below), whose sum is σ = 12586464. Its totient is φ = 12571500.

The previous prime is 12578959. The next prime is 12578983. The reversal of 12578981 is 18987521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12578981 is a prime.

It is a super-2 number, since 2×12578981² = 316461525996722, 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 (12578983) 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, 86 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (3146616).

Almost surely, 2^12578981 is an apocalyptic number.

It is an amenable number.

12578981 is a deficient number, since it is larger than the sum of its proper divisors (7483).

12578981 is an equidigital number, since it uses as much as digits as its factorization.

12578981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482.

The product of its digits is 40320, while the sum is 41.

The square root of 12578981 is about 3546.6859178676. The cubic root of 12578981 is about 232.5672122326.

The spelling of 12578981 in words is "twelve million, five hundred seventy-eight thousand, nine hundred eighty-one".