12909001 has 12 divisors (see below), whose sum is σ = 15900948. Its totient is φ = 10413312.

The previous prime is 12908993. The next prime is 12909047. The reversal of 12909001 is 10090921.

It can be written as a sum of positive squares in 2 ways, for example, as 11526025 + 1382976 = 3395^2 + 1176^2 .

It is not a de Polignac number, because 12909001 - 2³ = 12908993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12900001) 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, 6916 + ... + 8581.

It is an arithmetic number, because the mean of its divisors is an integer number (1325079).

Almost surely, 2^12909001 is an apocalyptic number.

It is an amenable number.

12909001 is a deficient number, since it is larger than the sum of its proper divisors (2991947).

12909001 is a wasteful number, since it uses less digits than its factorization.

12909001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15528 (or 15521 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 12909001 is about 3592.9098235274. The cubic root of 12909001 is about 234.5835448961.

Adding to 12909001 its reverse (10090921), we get a palindrome (22999922).

The spelling of 12909001 in words is "twelve million, nine hundred nine thousand, one".