1243041533 has 2 divisors, whose sum is σ = 1243041534. Its totient is φ = 1243041532.

The previous prime is 1243041521. The next prime is 1243041557. The reversal of 1243041533 is 3351403421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153417444 + 89624089 = 33962^2 + 9467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243041533 - 2¹⁸ = 1242779389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243041433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621520766 + 621520767.

It is an arithmetic number, because the mean of its divisors is an integer number (621520767).

Almost surely, 2^1243041533 is an apocalyptic number.

It is an amenable number.

1243041533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243041533 is an equidigital number, since it uses as much as digits as its factorization.

1243041533 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 26.

The square root of 1243041533 is about 35256.7941395698. The cubic root of 1243041533 is about 1075.2147493814.

Adding to 1243041533 its reverse (3351403421), we get a palindrome (4594444954).

The spelling of 1243041533 in words is "one billion, two hundred forty-three million, forty-one thousand, five hundred thirty-three".