12251391 has 8 divisors (see below), whose sum is σ = 16503984. Its totient is φ = 8083200.

The previous prime is 12251389. The next prime is 12251411. The reversal of 12251391 is 19315221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12251391 - 2¹ = 12251389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12251191) 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 in 7 ways as a sum of consecutive naturals, for example, 20760 + ... + 21341.

It is an arithmetic number, because the mean of its divisors is an integer number (2062998).

Almost surely, 2^12251391 is an apocalyptic number.

12251391 is a deficient number, since it is larger than the sum of its proper divisors (4252593).

12251391 is an equidigital number, since it uses as much as digits as its factorization.

12251391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42201.

The product of its digits is 540, while the sum is 24.

The square root of 12251391 is about 3500.1987086450. The cubic root of 12251391 is about 230.5305396018.

The spelling of 12251391 in words is "twelve million, two hundred fifty-one thousand, three hundred ninety-one".