12091251 has 4 divisors (see below), whose sum is σ = 16121672. Its totient is φ = 8060832.

The previous prime is 12091241. The next prime is 12091253. The reversal of 12091251 is 15219021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12091251 - 2¹³ = 12083059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12091253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015206 + ... + 2015211.

It is an arithmetic number, because the mean of its divisors is an integer number (4030418).

Almost surely, 2^12091251 is an apocalyptic number.

12091251 is a deficient number, since it is larger than the sum of its proper divisors (4030421).

12091251 is an equidigital number, since it uses as much as digits as its factorization.

12091251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030420.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12091251 is about 3477.2476184477. The cubic root of 12091251 is about 229.5216966307.

The spelling of 12091251 in words is "twelve million, ninety-one thousand, two hundred fifty-one".