1243400533 has 2 divisors, whose sum is σ = 1243400534. Its totient is φ = 1243400532.

The previous prime is 1243400531. The next prime is 1243400579. The reversal of 1243400533 is 3350043421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852231249 + 391169284 = 29193^2 + 19778^2 .

It is an emirp because it is prime and its reverse (3350043421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243400533 - 2¹ = 1243400531 is a prime.

Together with 1243400531, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1243400498 and 1243400507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243400531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621700266 + 621700267.

It is an arithmetic number, because the mean of its divisors is an integer number (621700267).

Almost surely, 2^1243400533 is an apocalyptic number.

It is an amenable number.

1243400533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243400533 is an equidigital number, since it uses as much as digits as its factorization.

1243400533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 1243400533 is about 35261.8849893196. The cubic root of 1243400533 is about 1075.3182495276.

Adding to 1243400533 its reverse (3350043421), we get a palindrome (4593443954).

The spelling of 1243400533 in words is "one billion, two hundred forty-three million, four hundred thousand, five hundred thirty-three".