12145523 has 6 divisors (see below), whose sum is σ = 13151844. Its totient is φ = 11211096.

The previous prime is 12145513. The next prime is 12145537. The reversal of 12145523 is 32554121.

It is not a de Polignac number, because 12145523 - 2¹² = 12141427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35765 + ... + 36102.

It is an arithmetic number, because the mean of its divisors is an integer number (2191974).

Almost surely, 2^12145523 is an apocalyptic number.

12145523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12145523 is a deficient number, since it is larger than the sum of its proper divisors (1006321).

12145523 is an equidigital number, since it uses as much as digits as its factorization.

12145523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71893 (or 71880 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 12145523 is about 3485.0427544006. The cubic root of 12145523 is about 229.8645894810.

Adding to 12145523 its reverse (32554121), we get a palindrome (44699644).

The spelling of 12145523 in words is "twelve million, one hundred forty-five thousand, five hundred twenty-three".