12145431 has 4 divisors (see below), whose sum is σ = 16193912. Its totient is φ = 8096952.

The previous prime is 12145417. The next prime is 12145433. The reversal of 12145431 is 13454121.

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

It is not a de Polignac number, because 12145431 - 2⁷ = 12145303 is a prime.

It is a super-2 number, since 2×12145431² = 295022988351522, 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 = 12145398 and 12145407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145433) 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, 2024236 + ... + 2024241.

It is an arithmetic number, because the mean of its divisors is an integer number (4048478).

Almost surely, 2^12145431 is an apocalyptic number.

12145431 is a deficient number, since it is larger than the sum of its proper divisors (4048481).

12145431 is an equidigital number, since it uses as much as digits as its factorization.

12145431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4048480.

The product of its digits is 480, while the sum is 21.

The square root of 12145431 is about 3485.0295551114. The cubic root of 12145431 is about 229.8640090862.

Adding to 12145431 its reverse (13454121), we get a palindrome (25599552).

The spelling of 12145431 in words is "twelve million, one hundred forty-five thousand, four hundred thirty-one".