12151591 has 4 divisors (see below), whose sum is σ = 12158800. Its totient is φ = 12144384.

The previous prime is 12151553. The next prime is 12151603. The reversal of 12151591 is 19515121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12151591 is a prime.

It is a super-2 number, since 2×12151591² = 295322327662562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12151501) 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, 430 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (3039700).

Almost surely, 2^12151591 is an apocalyptic number.

12151591 is a deficient number, since it is larger than the sum of its proper divisors (7209).

12151591 is an equidigital number, since it uses as much as digits as its factorization.

12151591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7208.

The product of its digits is 450, while the sum is 25.

The square root of 12151591 is about 3485.9132232458. The cubic root of 12151591 is about 229.9028638341.

The spelling of 12151591 in words is "twelve million, one hundred fifty-one thousand, five hundred ninety-one".