1242543505 has 8 divisors (see below), whose sum is σ = 1704059712. Its totient is φ = 852029808.

The previous prime is 1242543493. The next prime is 1242543539. The reversal of 1242543505 is 5053452421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242543505 - 2⁵ = 1242543473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17750587 + ... + 17750656.

It is an arithmetic number, because the mean of its divisors is an integer number (213007464).

Almost surely, 2^1242543505 is an apocalyptic number.

It is an amenable number.

1242543505 is a deficient number, since it is larger than the sum of its proper divisors (461516207).

1242543505 is an equidigital number, since it uses as much as digits as its factorization.

1242543505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35501255.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 1242543505 is about 35249.7305663462. The cubic root of 1242543505 is about 1075.0711342869.

Adding to 1242543505 its reverse (5053452421), we get a palindrome (6295995926).

The spelling of 1242543505 in words is "one billion, two hundred forty-two million, five hundred forty-three thousand, five hundred five".