243104213531 has 2 divisors, whose sum is σ = 243104213532. Its totient is φ = 243104213530.

The previous prime is 243104213507. The next prime is 243104213543. The reversal of 243104213531 is 135312401342.

243104213531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243104213531 is a prime.

It is a super-2 number, since 2×243104213531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243104213494 and 243104213503.

It is not a weakly prime, because it can be changed into another prime (243103213531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121552106765 + 121552106766.

It is an arithmetic number, because the mean of its divisors is an integer number (121552106766).

Almost surely, 2^243104213531 is an apocalyptic number.

243104213531 is a deficient number, since it is larger than the sum of its proper divisors (1).

243104213531 is an equidigital number, since it uses as much as digits as its factorization.

243104213531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 243104213531 its reverse (135312401342), we get a palindrome (378416614873).

The spelling of 243104213531 in words is "two hundred forty-three billion, one hundred four million, two hundred thirteen thousand, five hundred thirty-one".