1226039981 has 2 divisors, whose sum is σ = 1226039982. Its totient is φ = 1226039980.

The previous prime is 1226039977. The next prime is 1226040071. The reversal of 1226039981 is 1899306221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694322500 + 531717481 = 26350^2 + 23059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226039981 - 2² = 1226039977 is a prime.

It is a super-2 number, since 2×1226039981² = 3006348070020960722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226039281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613019990 + 613019991.

It is an arithmetic number, because the mean of its divisors is an integer number (613019991).

Almost surely, 2^1226039981 is an apocalyptic number.

It is an amenable number.

1226039981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226039981 is an equidigital number, since it uses as much as digits as its factorization.

1226039981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1226039981 is about 35014.8537195288. The cubic root of 1226039981 is about 1070.2901885648.

The spelling of 1226039981 in words is "one billion, two hundred twenty-six million, thirty-nine thousand, nine hundred eighty-one".