331540452 has 60 divisors (see below), whose sum is σ = 870485616. Its totient is φ = 110487240.

The previous prime is 331540427. The next prime is 331540457. The reversal of 331540452 is 254045133.

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

It is not an unprimeable number, because it can be changed into a prime (331540457) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 76627 + ... + 80837.

Almost surely, 2^331540452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331540452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435242808).

331540452 is an abundant number, since it is smaller than the sum of its proper divisors (538945164).

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

331540452 is an frugal number, since it uses more digits than its factorization.

331540452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242 (or 4216 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 331540452 is about 18208.2523049303. The cubic root of 331540452 is about 692.1159244240.

Adding to 331540452 its reverse (254045133), we get a palindrome (585585585).

The spelling of 331540452 in words is "three hundred thirty-one million, five hundred forty thousand, four hundred fifty-two".