12891851 has 12 divisors (see below), whose sum is σ = 15063048. Its totient is φ = 11001312.

The previous prime is 12891839. The next prime is 12891869. The reversal of 12891851 is 15819821.

It is not a de Polignac number, because 12891851 - 2¹⁸ = 12629707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12891811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14615 + ... + 15471.

It is an arithmetic number, because the mean of its divisors is an integer number (1255254).

Almost surely, 2^12891851 is an apocalyptic number.

12891851 is a deficient number, since it is larger than the sum of its proper divisors (2171197).

12891851 is an equidigital number, since it uses as much as digits as its factorization.

12891851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178 (or 1171 counting only the distinct ones).

The product of its digits is 5760, while the sum is 35.

The square root of 12891851 is about 3590.5223853919. The cubic root of 12891851 is about 234.4796150692.

The spelling of 12891851 in words is "twelve million, eight hundred ninety-one thousand, eight hundred fifty-one".