12145771 has 16 divisors (see below), whose sum is σ = 14070528. Its totient is φ = 10375200.

The previous prime is 12145759. The next prime is 12145781. The reversal of 12145771 is 17754121.

It is not a de Polignac number, because 12145771 - 2⁵ = 12145739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145711) 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 15 ways as a sum of consecutive naturals, for example, 15040 + ... + 15826.

It is an arithmetic number, because the mean of its divisors is an integer number (879408).

Almost surely, 2^12145771 is an apocalyptic number.

12145771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12145771 is a deficient number, since it is larger than the sum of its proper divisors (1924757).

12145771 is a wasteful number, since it uses less digits than its factorization.

12145771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its digits is 1960, while the sum is 28.

The square root of 12145771 is about 3485.0783348441. The cubic root of 12145771 is about 229.8661540090.

Adding to 12145771 its reverse (17754121), we get a palindrome (29899892).

The spelling of 12145771 in words is "twelve million, one hundred forty-five thousand, seven hundred seventy-one".