12251331 has 12 divisors (see below), whose sum is σ = 18352152. Its totient is φ = 8167392.

The previous prime is 12251299. The next prime is 12251357. The reversal of 12251331 is 13315221.

12251331 is a `hidden beast` number, since 122 + 513 + 31 = 666.

It is not a de Polignac number, because 12251331 - 2⁵ = 12251299 is a prime.

It is a super-2 number, since 2×12251331² = 300190222543122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12251131) 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 11 ways as a sum of consecutive naturals, for example, 24966 + ... + 25451.

It is an arithmetic number, because the mean of its divisors is an integer number (1529346).

Almost surely, 2^12251331 is an apocalyptic number.

12251331 is a deficient number, since it is larger than the sum of its proper divisors (6100821).

12251331 is an frugal number, since it uses more digits than its factorization.

12251331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50432 (or 50420 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 12251331 is about 3500.1901376925. The cubic root of 12251331 is about 230.5301632675.

Adding to 12251331 its reverse (13315221), we get a palindrome (25566552).

It can be divided in two parts, 1225 and 1331, that added together give a triangular number (2556 = T₇₁).

The spelling of 12251331 in words is "twelve million, two hundred fifty-one thousand, three hundred thirty-one".