1253565503 has 4 divisors (see below), whose sum is σ = 1253676768. Its totient is φ = 1253454240.

The previous prime is 1253565493. The next prime is 1253565539. The reversal of 1253565503 is 3055653521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3055653521 = 2531 ⋅1207291.

It is a cyclic number.

It is not a de Polignac number, because 1253565503 - 2²⁰ = 1252516927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253565583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36551 + ... + 61992.

It is an arithmetic number, because the mean of its divisors is an integer number (313419192).

Almost surely, 2^1253565503 is an apocalyptic number.

1253565503 is a deficient number, since it is larger than the sum of its proper divisors (111265).

1253565503 is an equidigital number, since it uses as much as digits as its factorization.

1253565503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111264.

The product of its (nonzero) digits is 67500, while the sum is 35.

The square root of 1253565503 is about 35405.7269802500. The cubic root of 1253565503 is about 1078.2405918413.

The spelling of 1253565503 in words is "one billion, two hundred fifty-three million, five hundred sixty-five thousand, five hundred three".