1213525435503 has 4 divisors (see below), whose sum is σ = 1618033914008. Its totient is φ = 809016957000.

The previous prime is 1213525435471. The next prime is 1213525435513. The reversal of 1213525435503 is 3055345253121.

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

It is not a de Polignac number, because 1213525435503 - 2⁵ = 1213525435471 is a prime.

It is a super-2 number, since 2×1213525435503² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213525435513) 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, 202254239248 + ... + 202254239253.

It is an arithmetic number, because the mean of its divisors is an integer number (404508478502).

Almost surely, 2^{1213525435503} is an apocalyptic number.

1213525435503 is a deficient number, since it is larger than the sum of its proper divisors (404508478505).

1213525435503 is an equidigital number, since it uses as much as digits as its factorization.

1213525435503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404508478504.

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 1213525435503 in words is "one trillion, two hundred thirteen billion, five hundred twenty-five million, four hundred thirty-five thousand, five hundred three".