12690581 has 2 divisors, whose sum is σ = 12690582. Its totient is φ = 12690580.

The previous prime is 12690577. The next prime is 12690589. The reversal of 12690581 is 18509621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 1575025 = 3334^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 12690581 - 2² = 12690577 is a prime.

It is a super-2 number, since 2×12690581² = 322101692235122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12690589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345290 + 6345291.

It is an arithmetic number, because the mean of its divisors is an integer number (6345291).

Almost surely, 2^12690581 is an apocalyptic number.

It is an amenable number.

12690581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12690581 is an equidigital number, since it uses as much as digits as its factorization.

12690581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 12690581 is about 3562.3841735557. The cubic root of 12690581 is about 233.2529625692.

The spelling of 12690581 in words is "twelve million, six hundred ninety thousand, five hundred eighty-one".