12691081 has 8 divisors (see below), whose sum is σ = 13958784. Its totient is φ = 11465040.

The previous prime is 12691079. The next prime is 12691087. The reversal of 12691081 is 18019621.

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 12691081 - 2¹ = 12691079 is a prime.

It is a super-2 number, since 2×12691081² = 322127073897122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12691087) 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, 9775 + ... + 10996.

It is an arithmetic number, because the mean of its divisors is an integer number (1744848).

Almost surely, 2^12691081 is an apocalyptic number.

It is an amenable number.

12691081 is a deficient number, since it is larger than the sum of its proper divisors (1267703).

12691081 is a wasteful number, since it uses less digits than its factorization.

12691081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20831.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12691081 is about 3562.4543505847. The cubic root of 12691081 is about 233.2560258634.

The spelling of 12691081 in words is "twelve million, six hundred ninety-one thousand, eighty-one".