12145661 has 8 divisors (see below), whose sum is σ = 13387584. Its totient is φ = 10926720.

The previous prime is 12145607. The next prime is 12145669. The reversal of 12145661 is 16654121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12145661 - 2⁶ = 12145597 is a prime.

It is a super-2 number, since 2×12145661² = 295034162253842, which contains 22 as substring.

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 12145661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145669) 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, 4625 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (1673448).

Almost surely, 2^12145661 is an apocalyptic number.

12145661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12145661 is a deficient number, since it is larger than the sum of its proper divisors (1241923).

12145661 is a wasteful number, since it uses less digits than its factorization.

12145661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11491.

The product of its digits is 1440, while the sum is 26.

The square root of 12145661 is about 3485.0625532406. The cubic root of 12145661 is about 229.8654600677.

Adding to 12145661 its reverse (16654121), we get a palindrome (28799782).

The spelling of 12145661 in words is "twelve million, one hundred forty-five thousand, six hundred sixty-one".