1242432281 has 2 divisors, whose sum is σ = 1242432282. Its totient is φ = 1242432280.

The previous prime is 1242432223. The next prime is 1242432329. The reversal of 1242432281 is 1822342421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 878233225 + 364199056 = 29635^2 + 19084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242432281 - 2¹⁰ = 1242431257 is a prime.

It is a super-2 number, since 2×1242432281² = 3087275945741725922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1242432221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621216140 + 621216141.

It is an arithmetic number, because the mean of its divisors is an integer number (621216141).

Almost surely, 2^1242432281 is an apocalyptic number.

It is an amenable number.

1242432281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242432281 is an equidigital number, since it uses as much as digits as its factorization.

1242432281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 29.

The square root of 1242432281 is about 35248.1528735904. The cubic root of 1242432281 is about 1075.0390556570.

The spelling of 1242432281 in words is "one billion, two hundred forty-two million, four hundred thirty-two thousand, two hundred eighty-one".