331522420 has 24 divisors (see below), whose sum is σ = 709335144. Its totient is φ = 130106496.

The previous prime is 331522417. The next prime is 331522439. The reversal of 331522420 is 24225133.

331522420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 109035364 + 222487056 = 10442^2 + 14916^2 .

It is a super-2 number, since 2×331522420² = 219814229925312800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331522391 and 331522400.

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, 155319 + ... + 157438.

It is an arithmetic number, because the mean of its divisors is an integer number (29555631).

Almost surely, 2^331522420 is an apocalyptic number.

It is an amenable number.

331522420 is an abundant number, since it is smaller than the sum of its proper divisors (377812724).

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

331522420 is a wasteful number, since it uses less digits than its factorization.

331522420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312819 (or 312817 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 331522420 is about 18207.7571380991. The cubic root of 331522420 is about 692.1033764725.

Adding to 331522420 its reverse (24225133), we get a palindrome (355747553).

The spelling of 331522420 in words is "three hundred thirty-one million, five hundred twenty-two thousand, four hundred twenty".