1243242401 has 2 divisors, whose sum is σ = 1243242402. Its totient is φ = 1243242400.

The previous prime is 1243242397. The next prime is 1243242443. The reversal of 1243242401 is 1042423421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240730176 + 2512225 = 35224^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243242401 - 2² = 1243242397 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243242601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621621200 + 621621201.

It is an arithmetic number, because the mean of its divisors is an integer number (621621201).

Almost surely, 2^1243242401 is an apocalyptic number.

It is an amenable number.

1243242401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243242401 is an equidigital number, since it uses as much as digits as its factorization.

1243242401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1243242401 is about 35259.6426669358. The cubic root of 1243242401 is about 1075.2726623308.

Adding to 1243242401 its reverse (1042423421), we get a palindrome (2285665822).

The spelling of 1243242401 in words is "one billion, two hundred forty-three million, two hundred forty-two thousand, four hundred one".