12543019 has 4 divisors (see below), whose sum is σ = 12615696. Its totient is φ = 12470344.

The previous prime is 12542989. The next prime is 12543053. The reversal of 12543019 is 91034521.

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 12543019 - 2⁷ = 12542891 is a prime.

It is a super-2 number, since 2×12543019² = 314654651268722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12542984 and 12543002.

It is not an unprimeable number, because it can be changed into a prime (12543319) 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, 36079 + ... + 36424.

It is an arithmetic number, because the mean of its divisors is an integer number (3153924).

Almost surely, 2^12543019 is an apocalyptic number.

12543019 is a deficient number, since it is larger than the sum of its proper divisors (72677).

12543019 is an equidigital number, since it uses as much as digits as its factorization.

12543019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72676.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12543019 is about 3541.6124858601. The cubic root of 12543019 is about 232.3453721919.

The spelling of 12543019 in words is "twelve million, five hundred forty-three thousand, nineteen".