1253545243 has 4 divisors (see below), whose sum is σ = 1254376368. Its totient is φ = 1252714120.

The previous prime is 1253545199. The next prime is 1253545247. The reversal of 1253545243 is 3425453521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1253545243 - 2⁹ = 1253544731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1253545199 and 1253545208.

It is not an unprimeable number, because it can be changed into a prime (1253545247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413296 + ... + 416317.

It is an arithmetic number, because the mean of its divisors is an integer number (313594092).

Almost surely, 2^1253545243 is an apocalyptic number.

1253545243 is a deficient number, since it is larger than the sum of its proper divisors (831125).

1253545243 is an equidigital number, since it uses as much as digits as its factorization.

1253545243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831124.

The product of its digits is 72000, while the sum is 34.

The square root of 1253545243 is about 35405.4408671888. The cubic root of 1253545243 is about 1078.2347830045.

Adding to 1253545243 its reverse (3425453521), we get a palindrome (4678998764).

The spelling of 1253545243 in words is "one billion, two hundred fifty-three million, five hundred forty-five thousand, two hundred forty-three".