1813229553 has 24 divisors (see below), whose sum is σ = 2536384320. Its totient is φ = 1150853760.

The previous prime is 1813229549. The next prime is 1813229629. The reversal of 1813229553 is 3559223181.

It is not a de Polignac number, because 1813229553 - 2² = 1813229549 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1813229513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461668 + ... + 465578.

It is an arithmetic number, because the mean of its divisors is an integer number (105682680).

Almost surely, 2^1813229553 is an apocalyptic number.

It is an amenable number.

1813229553 is a deficient number, since it is larger than the sum of its proper divisors (723154767).

1813229553 is an equidigital number, since it uses as much as digits as its factorization.

1813229553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089 (or 4016 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 1813229553 is about 42582.0332182483. The cubic root of 1813229553 is about 1219.4133058751.

The spelling of 1813229553 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, five hundred fifty-three".