331261 has 8 divisors (see below), whose sum is σ = 389120. Its totient is φ = 276048.

The previous prime is 331259. The next prime is 331277. The reversal of 331261 is 162133.

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

It is a cyclic number.

It is not a de Polignac number, because 331261 - 2¹ = 331259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 898.

It is an arithmetic number, because the mean of its divisors is an integer number (48640).

2³³¹²⁶¹ is an apocalyptic number.

It is an amenable number.

331261 is a deficient number, since it is larger than the sum of its proper divisors (57859).

331261 is a wasteful number, since it uses less digits than its factorization.

331261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323.

The product of its digits is 108, while the sum is 16.

The square root of 331261 is about 575.5527777711. The cubic root of 331261 is about 69.1921410657.

Adding to 331261 its reverse (162133), we get a palindrome (493394).

The spelling of 331261 in words is "three hundred thirty-one thousand, two hundred sixty-one".