12151813 has 4 divisors (see below), whose sum is σ = 12226528. Its totient is φ = 12077100.

The previous prime is 12151801. The next prime is 12151823. The reversal of 12151813 is 31815121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12151813 - 2¹⁷ = 12020741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12151823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37113 + ... + 37438.

It is an arithmetic number, because the mean of its divisors is an integer number (3056632).

Almost surely, 2^12151813 is an apocalyptic number.

It is an amenable number.

12151813 is a deficient number, since it is larger than the sum of its proper divisors (74715).

12151813 is an equidigital number, since it uses as much as digits as its factorization.

12151813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74714.

The product of its digits is 240, while the sum is 22.

The square root of 12151813 is about 3485.9450655454. The cubic root of 12151813 is about 229.9042638736.

Adding to 12151813 its reverse (31815121), we get a palindrome (43966934).

The spelling of 12151813 in words is "twelve million, one hundred fifty-one thousand, eight hundred thirteen".