1813533825 has 48 divisors (see below), whose sum is σ = 3058415360. Its totient is φ = 948049920.

The previous prime is 1813533811. The next prime is 1813533829. The reversal of 1813533825 is 5283353181.

It is not a de Polignac number, because 1813533825 - 2⁴ = 1813533809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813533829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 791832 + ... + 794118.

Almost surely, 2^1813533825 is an apocalyptic number.

1813533825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1813533825 is a deficient number, since it is larger than the sum of its proper divisors (1244881535).

1813533825 is a wasteful number, since it uses less digits than its factorization.

1813533825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2501 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 1813533825 is about 42585.6058428197. The cubic root of 1813533825 is about 1219.4815106192.

The spelling of 1813533825 in words is "one billion, eight hundred thirteen million, five hundred thirty-three thousand, eight hundred twenty-five".