12620981 has 2 divisors, whose sum is σ = 12620982. Its totient is φ = 12620980.

The previous prime is 12620977. The next prime is 12621017. The reversal of 12620981 is 18902621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8584900 + 4036081 = 2930^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 12620981 - 2² = 12620977 is a prime.

It is a super-2 number, since 2×12620981² = 318578322804722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12623981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310490 + 6310491.

It is an arithmetic number, because the mean of its divisors is an integer number (6310491).

Almost surely, 2^12620981 is an apocalyptic number.

It is an amenable number.

12620981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12620981 is an equidigital number, since it uses as much as digits as its factorization.

12620981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 12620981 is about 3552.6020041654. The cubic root of 12620981 is about 232.8257644891.

The spelling of 12620981 in words is "twelve million, six hundred twenty thousand, nine hundred eighty-one".