12011491 has 4 divisors (see below), whose sum is σ = 12290872. Its totient is φ = 11732112.

The previous prime is 12011471. The next prime is 12011501. The reversal of 12011491 is 19411021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19411021 = 7 ⋅2773003.

It is a cyclic number.

It is not a de Polignac number, because 12011491 - 2⁵ = 12011459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011411) 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, 139626 + ... + 139711.

It is an arithmetic number, because the mean of its divisors is an integer number (3072718).

Almost surely, 2^12011491 is an apocalyptic number.

12011491 is a deficient number, since it is larger than the sum of its proper divisors (279381).

12011491 is an equidigital number, since it uses as much as digits as its factorization.

12011491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279380.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 12011491 is about 3465.7598012557. The cubic root of 12011491 is about 229.0159024825.

It can be divided in two parts, 120 and 11491, that added together give a palindrome (11611).

The spelling of 12011491 in words is "twelve million, eleven thousand, four hundred ninety-one".