331331631 has 8 divisors (see below), whose sum is σ = 442826544. Its totient is φ = 220362240.

The previous prime is 331331593. The next prime is 331331657. The reversal of 331331631 is 136133133.

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

It is a de Polignac number, because none of the positive numbers 2^k-331331631 is a prime.

It is a super-3 number, since 3×331331631³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331331431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129906 + ... + 132431.

It is an arithmetic number, because the mean of its divisors is an integer number (55353318).

Almost surely, 2^331331631 is an apocalyptic number.

331331631 is a deficient number, since it is larger than the sum of its proper divisors (111494913).

331331631 is a wasteful number, since it uses less digits than its factorization.

331331631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262761.

The product of its digits is 1458, while the sum is 24.

The square root of 331331631 is about 18202.5171610962. The cubic root of 331331631 is about 691.9705839958.

Adding to 331331631 its reverse (136133133), we get a palindrome (467464764).

The spelling of 331331631 in words is "three hundred thirty-one million, three hundred thirty-one thousand, six hundred thirty-one".