1213533000 has 96 divisors (see below), whose sum is σ = 4101771960. Its totient is φ = 323606400.

The previous prime is 1213532987. The next prime is 1213533019. The reversal of 1213533000 is 3353121.

1213533000 is a `hidden beast` number, since 12 + 1 + 353 + 300 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 265755204 + 947777796 = 16302^2 + 30786^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 58419 + ... + 76418.

Almost surely, 2^1213533000 is an apocalyptic number.

1213533000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213533000 is an abundant number, since it is smaller than the sum of its proper divisors (2888238960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213533000 is a wasteful number, since it uses less digits than its factorization.

1213533000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134864 (or 134847 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 1213533000 is about 34835.8005505830. The cubic root of 1213533000 is about 1066.6383564535.

Adding to 1213533000 its reverse (3353121), we get a palindrome (1216886121).

The spelling of 1213533000 in words is "one billion, two hundred thirteen million, five hundred thirty-three thousand".