1242005231 has 2 divisors, whose sum is σ = 1242005232. Its totient is φ = 1242005230.

The previous prime is 1242005207. The next prime is 1242005257. The reversal of 1242005231 is 1325002421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242005231 is a prime.

It is a super-2 number, since 2×1242005231² = 3085153987662726722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242005131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621002615 + 621002616.

It is an arithmetic number, because the mean of its divisors is an integer number (621002616).

Almost surely, 2^1242005231 is an apocalyptic number.

1242005231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242005231 is an equidigital number, since it uses as much as digits as its factorization.

1242005231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1242005231 is about 35242.0945887159. The cubic root of 1242005231 is about 1074.9158703947.

Adding to 1242005231 its reverse (1325002421), we get a palindrome (2567007652).

The spelling of 1242005231 in words is "one billion, two hundred forty-two million, five thousand, two hundred thirty-one".