1242553105 has 4 divisors (see below), whose sum is σ = 1491063732. Its totient is φ = 994042480.

The previous prime is 1242553097. The next prime is 1242553121. The reversal of 1242553105 is 5013552421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5013552421 = 22567 ⋅222163.

It can be written as a sum of positive squares in 2 ways, for example, as 401321089 + 841232016 = 20033^2 + 29004^2 .

It is not a de Polignac number, because 1242553105 - 2³ = 1242553097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124255306 + ... + 124255315.

It is an arithmetic number, because the mean of its divisors is an integer number (372765933).

Almost surely, 2^1242553105 is an apocalyptic number.

It is an amenable number.

1242553105 is a deficient number, since it is larger than the sum of its proper divisors (248510627).

1242553105 is an equidigital number, since it uses as much as digits as its factorization.

1242553105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248510626.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1242553105 is about 35249.8667373368. The cubic root of 1242553105 is about 1075.0739029777.

The spelling of 1242553105 in words is "one billion, two hundred forty-two million, five hundred fifty-three thousand, one hundred five".