12290981 has 2 divisors, whose sum is σ = 12290982. Its totient is φ = 12290980.

The previous prime is 12290977. The next prime is 12290987. The reversal of 12290981 is 18909221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 792100 = 3391^2 + 890^2 .

It is an emirp because it is prime and its reverse (18909221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12290981 - 2² = 12290977 is a prime.

It is a super-2 number, since 2×12290981² = 302136427884722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12290987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145490 + 6145491.

It is an arithmetic number, because the mean of its divisors is an integer number (6145491).

Almost surely, 2^12290981 is an apocalyptic number.

It is an amenable number.

12290981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12290981 is an equidigital number, since it uses as much as digits as its factorization.

12290981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12290981 is about 3505.8495404110. The cubic root of 12290981 is about 230.7785900962.

The spelling of 12290981 in words is "twelve million, two hundred ninety thousand, nine hundred eighty-one".