331841820 has 24 divisors (see below), whose sum is σ = 929157264. Its totient is φ = 88491136.

The previous prime is 331841803. The next prime is 331841837. The reversal of 331841820 is 28148133.

331841820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (331841803) and next prime (331841837).

It is a super-2 number, since 2×331841820² = 220237987001824800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2765289 + ... + 2765408.

It is an arithmetic number, because the mean of its divisors is an integer number (38714886).

Almost surely, 2^331841820 is an apocalyptic number.

331841820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331841820 is an abundant number, since it is smaller than the sum of its proper divisors (597315444).

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

331841820 is a wasteful number, since it uses less digits than its factorization.

331841820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530709 (or 5530707 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 331841820 is about 18216.5260134857. The cubic root of 331841820 is about 692.3255704595.

Adding to 331841820 its reverse (28148133), we get a palindrome (359989953).

The spelling of 331841820 in words is "three hundred thirty-one million, eight hundred forty-one thousand, eight hundred twenty".