12981523 has 4 divisors (see below), whose sum is σ = 13745160. Its totient is φ = 12217888.

The previous prime is 12981511. The next prime is 12981539. The reversal of 12981523 is 32518921.

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

It is a cyclic number.

It is not a de Polignac number, because 12981523 - 2⁵ = 12981491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12981623) 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, 381793 + ... + 381826.

It is an arithmetic number, because the mean of its divisors is an integer number (3436290).

Almost surely, 2^12981523 is an apocalyptic number.

12981523 is a deficient number, since it is larger than the sum of its proper divisors (763637).

12981523 is an equidigital number, since it uses as much as digits as its factorization.

12981523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763636.

The product of its digits is 4320, while the sum is 31.

The square root of 12981523 is about 3602.9880654812. The cubic root of 12981523 is about 235.0220169503.

The spelling of 12981523 in words is "twelve million, nine hundred eighty-one thousand, five hundred twenty-three".