1242026281 has 2 divisors, whose sum is σ = 1242026282. Its totient is φ = 1242026280.

The previous prime is 1242026213. The next prime is 1242026309. The reversal of 1242026281 is 1826202421.

It is an a-pointer prime, because the next prime (1242026309) can be obtained adding 1242026281 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836366400 + 405659881 = 28920^2 + 20141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242026281 - 2¹⁵ = 1241993513 is a prime.

It is a super-2 number, since 2×1242026281² = 3085258565389381922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1242026081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621013140 + 621013141.

It is an arithmetic number, because the mean of its divisors is an integer number (621013141).

Almost surely, 2^1242026281 is an apocalyptic number.

It is an amenable number.

1242026281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242026281 is an equidigital number, since it uses as much as digits as its factorization.

1242026281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1242026281 is about 35242.3932359878. The cubic root of 1242026281 is about 1074.9219430614.

The spelling of 1242026281 in words is "one billion, two hundred forty-two million, twenty-six thousand, two hundred eighty-one".