12277981 has 2 divisors, whose sum is σ = 12277982. Its totient is φ = 12277980.

The previous prime is 12277973. The next prime is 12278003. The reversal of 12277981 is 18977221.

It is the 1431-st star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10692900 + 1585081 = 3270^2 + 1259^2 .

It is an emirp because it is prime and its reverse (18977221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12277981 - 2³ = 12277973 is a prime.

It is a super-2 number, since 2×12277981² = 301497634872722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12277981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12277381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6138990 + 6138991.

It is an arithmetic number, because the mean of its divisors is an integer number (6138991).

Almost surely, 2^12277981 is an apocalyptic number.

It is an amenable number.

12277981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12277981 is an equidigital number, since it uses as much as digits as its factorization.

12277981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 12277981 is about 3503.9950057042. The cubic root of 12277981 is about 230.6971976231.

The spelling of 12277981 in words is "twelve million, two hundred seventy-seven thousand, nine hundred eighty-one".