331238985 has 128 divisors (see below), whose sum is σ = 710221824. Its totient is φ = 127733760.

The previous prime is 331238981. The next prime is 331238993. The reversal of 331238985 is 589832133.

It is not a de Polignac number, because 331238985 - 2² = 331238981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (331238981) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 982737 + ... + 983073.

It is an arithmetic number, because the mean of its divisors is an integer number (5548608).

Almost surely, 2^331238985 is an apocalyptic number.

331238985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

331238985 is an abundant number, since it is smaller than the sum of its proper divisors (378982839).

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

331238985 is a wasteful number, since it uses less digits than its factorization.

331238985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423.

The product of its digits is 155520, while the sum is 42.

The square root of 331238985 is about 18199.9721153633. The cubic root of 331238985 is about 691.9060823737.

The spelling of 331238985 in words is "three hundred thirty-one million, two hundred thirty-eight thousand, nine hundred eighty-five".