12509019 has 8 divisors (see below), whose sum is σ = 18531920. Its totient is φ = 8339328.

The previous prime is 12509009. The next prime is 12509083. The reversal of 12509019 is 91090521.

It is a happy number.

It is not a de Polignac number, because 12509019 - 2⁸ = 12508763 is a prime.

It is a super-2 number, since 2×12509019² = 312951112684722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 463297 = 12509019 / (1 + 2 + 5 + 0 + 9 + 0 + 1 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12508983 and 12509001.

It is not an unprimeable number, because it can be changed into a prime (12509009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231622 + ... + 231675.

It is an arithmetic number, because the mean of its divisors is an integer number (2316490).

Almost surely, 2^12509019 is an apocalyptic number.

12509019 is a deficient number, since it is larger than the sum of its proper divisors (6022901).

12509019 is an equidigital number, since it uses as much as digits as its factorization.

12509019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463306 (or 463300 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 12509019 is about 3536.8091551567. The cubic root of 12509019 is about 232.1352449147.

The spelling of 12509019 in words is "twelve million, five hundred nine thousand, nineteen".