12219531 has 4 divisors (see below), whose sum is σ = 16292712. Its totient is φ = 8146352.

The previous prime is 12219523. The next prime is 12219533. The reversal of 12219531 is 13591221.

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 12219531 - 2³ = 12219523 is a prime.

It is a super-2 number, since 2×12219531² = 298633875719922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12219533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036586 + ... + 2036591.

It is an arithmetic number, because the mean of its divisors is an integer number (4073178).

Almost surely, 2^12219531 is an apocalyptic number.

12219531 is a deficient number, since it is larger than the sum of its proper divisors (4073181).

12219531 is an equidigital number, since it uses as much as digits as its factorization.

12219531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073180.

The product of its digits is 540, while the sum is 24.

The square root of 12219531 is about 3495.6445757542. The cubic root of 12219531 is about 230.3305329552.

The spelling of 12219531 in words is "twelve million, two hundred nineteen thousand, five hundred thirty-one".