12161345 has 16 divisors (see below), whose sum is σ = 17131008. Its totient is φ = 8112960.

The previous prime is 12161333. The next prime is 12161351. The reversal of 12161345 is 54316121.

It is not a de Polignac number, because 12161345 - 2⁴ = 12161329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12161345.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3401 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (1070688).

Almost surely, 2^12161345 is an apocalyptic number.

It is an amenable number.

12161345 is a deficient number, since it is larger than the sum of its proper divisors (4969663).

12161345 is an equidigital number, since it uses as much as digits as its factorization.

12161345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9440.

The product of its digits is 720, while the sum is 23.

The square root of 12161345 is about 3487.3120021013. The cubic root of 12161345 is about 229.9643612077.

Adding to 12161345 its reverse (54316121), we get a palindrome (66477466).

The spelling of 12161345 in words is "twelve million, one hundred sixty-one thousand, three hundred forty-five".