12013531 has 2 divisors, whose sum is σ = 12013532. Its totient is φ = 12013530.

The previous prime is 12013517. The next prime is 12013541. The reversal of 12013531 is 13531021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12013531 - 2⁵ = 12013499 is a prime.

It is a super-2 number, since 2×12013531² = 288649854175922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12013501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006765 + 6006766.

It is an arithmetic number, because the mean of its divisors is an integer number (6006766).

Almost surely, 2^12013531 is an apocalyptic number.

12013531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013531 is an equidigital number, since it uses as much as digits as its factorization.

12013531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 12013531 is about 3466.0540965196. The cubic root of 12013531 is about 229.0288669012.

Adding to 12013531 its reverse (13531021), we get a palindrome (25544552).

It can be divided in two parts, 12013 and 531, that added together give a square (12544 = 112²).

The spelling of 12013531 in words is "twelve million, thirteen thousand, five hundred thirty-one".