12991151 has 4 divisors (see below), whose sum is σ = 13211400. Its totient is φ = 12770904.

The previous prime is 12991141. The next prime is 12991157. The reversal of 12991151 is 15119921.

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

It is not a de Polignac number, because 12991151 - 2⁶ = 12991087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991157) 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, 110036 + ... + 110153.

It is an arithmetic number, because the mean of its divisors is an integer number (3302850).

Almost surely, 2^12991151 is an apocalyptic number.

12991151 is a deficient number, since it is larger than the sum of its proper divisors (220249).

12991151 is an equidigital number, since it uses as much as digits as its factorization.

12991151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220248.

The product of its digits is 810, while the sum is 29.

The square root of 12991151 is about 3604.3239310584. The cubic root of 12991151 is about 235.0801054811.

The spelling of 12991151 in words is "twelve million, nine hundred ninety-one thousand, one hundred fifty-one".