12639081 has 32 divisors (see below), whose sum is σ = 21081088. Its totient is φ = 6557760.

The previous prime is 12639079. The next prime is 12639083. The reversal of 12639081 is 18093621.

12639081 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12639079) and next prime (12639083).

It is not a de Polignac number, because 12639081 - 2¹ = 12639079 is a prime.

It is a super-3 number, since 3×12639081³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (12639083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17946 + ... + 18636.

It is an arithmetic number, because the mean of its divisors is an integer number (658784).

Almost surely, 2^12639081 is an apocalyptic number.

It is an amenable number.

12639081 is a deficient number, since it is larger than the sum of its proper divisors (8442007).

12639081 is a wasteful number, since it uses less digits than its factorization.

12639081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12639081 is about 3555.1485201043. The cubic root of 12639081 is about 232.9370113462.

The spelling of 12639081 in words is "twelve million, six hundred thirty-nine thousand, eighty-one".