1243420201 has 2 divisors, whose sum is σ = 1243420202. Its totient is φ = 1243420200.

The previous prime is 1243420183. The next prime is 1243420259. The reversal of 1243420201 is 1020243421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197506025 + 45914176 = 34605^2 + 6776^2 .

It is an emirp because it is prime and its reverse (1020243421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243420201 - 2²⁷ = 1109202473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243420271) 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, 621710100 + 621710101.

It is an arithmetic number, because the mean of its divisors is an integer number (621710101).

Almost surely, 2^1243420201 is an apocalyptic number.

It is an amenable number.

1243420201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243420201 is an equidigital number, since it uses as much as digits as its factorization.

1243420201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1243420201 is about 35262.1638729106. The cubic root of 1243420201 is about 1075.3239192608.

Adding to 1243420201 its reverse (1020243421), we get a palindrome (2263663622).

The spelling of 1243420201 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, two hundred one".