331761 has 4 divisors (see below), whose sum is σ = 442352. Its totient is φ = 221172.

The previous prime is 331753. The next prime is 331769. The reversal of 331761 is 167133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167133 = 3 ⋅55711.

It is an interprime number because it is at equal distance from previous prime (331753) and next prime (331769).

It is not a de Polignac number, because 331761 - 2³ = 331753 is a prime.

It is a super-2 number, since 2×331761² = 220130722242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55291 + ... + 55296.

It is an arithmetic number, because the mean of its divisors is an integer number (110588).

2³³¹⁷⁶¹ is an apocalyptic number.

It is an amenable number.

331761 is a deficient number, since it is larger than the sum of its proper divisors (110591).

331761 is a wasteful number, since it uses less digits than its factorization.

331761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110590.

The product of its digits is 378, while the sum is 21.

The square root of 331761 is about 575.9869790195. The cubic root of 331761 is about 69.2269360651.

Adding to 331761 its reverse (167133), we get a palindrome (498894).

The spelling of 331761 in words is "three hundred thirty-one thousand, seven hundred sixty-one".