12845631991 has 8 divisors (see below), whose sum is σ = 13409089184. Its totient is φ = 12293557920.

The previous prime is 12845631989. The next prime is 12845632001. The reversal of 12845631991 is 19913654821.

It is a happy number.

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 12845631991 - 2¹ = 12845631989 is a prime.

It is a super-2 number, since 2×12845631991² (a number of 21 digits) 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 (12845631091) 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, 2843475 + ... + 2847988.

It is an arithmetic number, because the mean of its divisors is an integer number (1676136148).

Almost surely, 2^12845631991 is an apocalyptic number.

12845631991 is a deficient number, since it is larger than the sum of its proper divisors (563457193).

12845631991 is an equidigital number, since it uses as much as digits as its factorization.

12845631991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691561.

The product of its digits is 466560, while the sum is 49.

The spelling of 12845631991 in words is "twelve billion, eight hundred forty-five million, six hundred thirty-one thousand, nine hundred ninety-one".