12618991 has 8 divisors (see below), whose sum is σ = 15732864. Its totient is φ = 9832920.

The previous prime is 12618989. The next prime is 12619007. The reversal of 12618991 is 19981621.

12618991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12618991 - 2¹ = 12618989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12618991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12618911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81865 + ... + 82018.

It is an arithmetic number, because the mean of its divisors is an integer number (1966608).

Almost surely, 2^12618991 is an apocalyptic number.

12618991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12618991 is a deficient number, since it is larger than the sum of its proper divisors (3113873).

12618991 is a wasteful number, since it uses less digits than its factorization.

12618991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163901.

The product of its digits is 7776, while the sum is 37.

The square root of 12618991 is about 3552.3219167187. The cubic root of 12618991 is about 232.8135269928.

The spelling of 12618991 in words is "twelve million, six hundred eighteen thousand, nine hundred ninety-one".