331731442 has 8 divisors (see below), whose sum is σ = 568682496. Its totient is φ = 142170612.

The previous prime is 331731427. The next prime is 331731497. The reversal of 331731442 is 244137133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×331731442² = 220091499222798728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331731442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11847538 + ... + 11847565.

It is an arithmetic number, because the mean of its divisors is an integer number (71085312).

Almost surely, 2^331731442 is an apocalyptic number.

331731442 is a deficient number, since it is larger than the sum of its proper divisors (236951054).

331731442 is a wasteful number, since it uses less digits than its factorization.

331731442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23695112.

The product of its digits is 6048, while the sum is 28.

The square root of 331731442 is about 18213.4961498335. The cubic root of 331731442 is about 692.2488009652.

Adding to 331731442 its reverse (244137133), we get a palindrome (575868575).

The spelling of 331731442 in words is "three hundred thirty-one million, seven hundred thirty-one thousand, four hundred forty-two".