331138 has 4 divisors (see below), whose sum is σ = 496710. Its totient is φ = 165568.

The previous prime is 331127. The next prime is 331141. The reversal of 331138 is 831133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831133 = 59 ⋅14087.

It can be written as a sum of positive squares in only one way, i.e., 328329 + 2809 = 573^2 + 53^2 .

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82783 + ... + 82786.

2³³¹¹³⁸ is an apocalyptic number.

331138 is a deficient number, since it is larger than the sum of its proper divisors (165572).

331138 is a wasteful number, since it uses less digits than its factorization.

331138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165571.

The product of its digits is 216, while the sum is 19.

The square root of 331138 is about 575.4459140527. The cubic root of 331138 is about 69.1835761306.

The spelling of 331138 in words is "three hundred thirty-one thousand, one hundred thirty-eight".