12257981 has 4 divisors (see below), whose sum is σ = 12680700. Its totient is φ = 11835264.

The previous prime is 12257977. The next prime is 12258007. The reversal of 12257981 is 18975221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18975221 = 461 ⋅41161.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 9665881 = 1610^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 12257981 - 2² = 12257977 is a prime.

It is a super-2 number, since 2×12257981² = 300516196392722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12257911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211316 + ... + 211373.

It is an arithmetic number, because the mean of its divisors is an integer number (3170175).

Almost surely, 2^12257981 is an apocalyptic number.

It is an amenable number.

12257981 is a deficient number, since it is larger than the sum of its proper divisors (422719).

12257981 is an equidigital number, since it uses as much as digits as its factorization.

12257981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422718.

The product of its digits is 10080, while the sum is 35.

The square root of 12257981 is about 3501.1399572139. The cubic root of 12257981 is about 230.5718661730.

The spelling of 12257981 in words is "twelve million, two hundred fifty-seven thousand, nine hundred eighty-one".