1213535000 has 80 divisors (see below), whose sum is σ = 2862677400. Its totient is φ = 482112000.

The previous prime is 1213534999. The next prime is 1213535023. The reversal of 1213535000 is 5353121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 814256 + ... + 815744.

Almost surely, 2^1213535000 is an apocalyptic number.

1213535000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213535000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431338700).

1213535000 is an abundant number, since it is smaller than the sum of its proper divisors (1649142400).

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

1213535000 is a wasteful number, since it uses less digits than its factorization.

1213535000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 1213535000 is about 34835.8292566719. The cubic root of 1213535000 is about 1066.6389424218.

Adding to 1213535000 its reverse (5353121), we get a palindrome (1218888121).

The spelling of 1213535000 in words is "one billion, two hundred thirteen million, five hundred thirty-five thousand".