1282237981 has 2 divisors, whose sum is σ = 1282237982. Its totient is φ = 1282237980.

The previous prime is 1282237963. The next prime is 1282238011. The reversal of 1282237981 is 1897322821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 891977956 + 390260025 = 29866^2 + 19755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1282237981 - 2⁵ = 1282237949 is a prime.

It is a super-2 number, since 2×1282237981² = 3288268479837912722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1282232981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641118990 + 641118991.

It is an arithmetic number, because the mean of its divisors is an integer number (641118991).

Almost surely, 2^1282237981 is an apocalyptic number.

It is an amenable number.

1282237981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1282237981 is an equidigital number, since it uses as much as digits as its factorization.

1282237981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 1282237981 is about 35808.3507159992. The cubic root of 1282237981 is about 1086.3994714337.

The spelling of 1282237981 in words is "one billion, two hundred eighty-two million, two hundred thirty-seven thousand, nine hundred eighty-one".