12912291 has 24 divisors (see below), whose sum is σ = 22107904. Its totient is φ = 7377480.

The previous prime is 12912287. The next prime is 12912293. The reversal of 12912291 is 19221921.

It is not a de Polignac number, because 12912291 - 2² = 12912287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12912293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2095 + ... + 5496.

Almost surely, 2^12912291 is an apocalyptic number.

12912291 is a deficient number, since it is larger than the sum of its proper divisors (9195613).

12912291 is an frugal number, since it uses more digits than its factorization.

12912291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7613 (or 7601 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 12912291 is about 3593.3676405289. The cubic root of 12912291 is about 234.6034719301.

It can be divided in two parts, 12912 and 291, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12912291 in words is "twelve million, nine hundred twelve thousand, two hundred ninety-one".