1243042535 has 12 divisors (see below), whose sum is σ = 1735186248. Its totient is φ = 852371856.

The previous prime is 1243042523. The next prime is 1243042543. The reversal of 1243042535 is 5352403421.

It is a happy number.

It is not a de Polignac number, because 1243042535 - 2⁴ = 1243042519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243042498 and 1243042507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2536577 + ... + 2537066.

It is an arithmetic number, because the mean of its divisors is an integer number (144598854).

Almost surely, 2^1243042535 is an apocalyptic number.

1243042535 is a deficient number, since it is larger than the sum of its proper divisors (492143713).

1243042535 is an equidigital number, since it uses as much as digits as its factorization.

1243042535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073662 (or 5073655 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 1243042535 is about 35256.8083495940. The cubic root of 1243042535 is about 1075.2150382870.

Adding to 1243042535 its reverse (5352403421), we get a palindrome (6595445956).

The spelling of 1243042535 in words is "one billion, two hundred forty-three million, forty-two thousand, five hundred thirty-five".