1253605543 has 4 divisors (see below), whose sum is σ = 1258372368. Its totient is φ = 1248838720.

The previous prime is 1253605519. The next prime is 1253605553. The reversal of 1253605543 is 3455063521.

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 1253605543 - 2⁵ = 1253605511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1253605499 and 1253605508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253605553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383018 + ... + 2383543.

It is an arithmetic number, because the mean of its divisors is an integer number (314593092).

Almost surely, 2^1253605543 is an apocalyptic number.

1253605543 is a deficient number, since it is larger than the sum of its proper divisors (4766825).

1253605543 is an equidigital number, since it uses as much as digits as its factorization.

1253605543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766824.

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 1253605543 is about 35406.2924209808. The cubic root of 1253605543 is about 1078.2520717077.

The spelling of 1253605543 in words is "one billion, two hundred fifty-three million, six hundred five thousand, five hundred forty-three".