331481881 has 2 divisors, whose sum is σ = 331481882. Its totient is φ = 331481880.

The previous prime is 331481879. The next prime is 331481893. The reversal of 331481881 is 188184133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207360000 + 124121881 = 14400^2 + 11141^2 .

It is a cyclic number.

It is not a de Polignac number, because 331481881 - 2¹ = 331481879 is a prime.

It is a super-2 number, since 2×331481881² = 219760474862596322, which contains 22 as substring.

Together with 331481879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 331481881.

It is not a weakly prime, because it can be changed into another prime (331488881) 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 as a sum of consecutive naturals, namely, 165740940 + 165740941.

It is an arithmetic number, because the mean of its divisors is an integer number (165740941).

Almost surely, 2^331481881 is an apocalyptic number.

It is an amenable number.

331481881 is a deficient number, since it is larger than the sum of its proper divisors (1).

331481881 is an equidigital number, since it uses as much as digits as its factorization.

331481881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 331481881 is about 18206.6438697526. The cubic root of 331481881 is about 692.0751648837.

The spelling of 331481881 in words is "three hundred thirty-one million, four hundred eighty-one thousand, eight hundred eighty-one".