331213536 has 120 divisors (see below), whose sum is σ = 992880504. Its totient is φ = 108276480.

The previous prime is 331213523. The next prime is 331213537. The reversal of 331213536 is 635312133.

It is a happy number.

331213536 is a `hidden beast` number, since 3 + 3 + 121 + 3 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331213537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 136171 + ... + 138581.

Almost surely, 2^331213536 is an apocalyptic number.

331213536 is a gapful number since it is divisible by the number (36) 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 331213536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496440252).

331213536 is an abundant number, since it is smaller than the sum of its proper divisors (661666968).

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

331213536 is a wasteful number, since it uses less digits than its factorization.

331213536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486 (or 2469 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 331213536 is about 18199.2729525110. The cubic root of 331213536 is about 691.8883622686. Note that the first 3 decimals are identical.

Adding to 331213536 its reverse (635312133), we get a palindrome (966525669).

The spelling of 331213536 in words is "three hundred thirty-one million, two hundred thirteen thousand, five hundred thirty-six".