12901665 has 64 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 5370624.

The previous prime is 12901663. The next prime is 12901699. The reversal of 12901665 is 56610921.

12901665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12901665 - 2¹ = 12901663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12901663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57744 + ... + 57966.

It is an arithmetic number, because the mean of its divisors is an integer number (403200).

Almost surely, 2^12901665 is an apocalyptic number.

12901665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12901665 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

12901665 is a wasteful number, since it uses less digits than its factorization.

12901665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12901665 is about 3591.8887789017. Note that the first 3 decimals coincide. The cubic root of 12901665 is about 234.5390996552.

The spelling of 12901665 in words is "twelve million, nine hundred one thousand, six hundred sixty-five".