331647961 has 2 divisors, whose sum is σ = 331647962. Its totient is φ = 331647960.

The previous prime is 331647959. The next prime is 331648001. The reversal of 331647961 is 169746133.

It is an a-pointer prime, because the next prime (331648001) can be obtained adding 331647961 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322382025 + 9265936 = 17955^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 331647961 - 2¹ = 331647959 is a prime.

Together with 331647959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (331647931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165823980 + 165823981.

It is an arithmetic number, because the mean of its divisors is an integer number (165823981).

Almost surely, 2^331647961 is an apocalyptic number.

It is an amenable number.

331647961 is a deficient number, since it is larger than the sum of its proper divisors (1).

331647961 is an equidigital number, since it uses as much as digits as its factorization.

331647961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 331647961 is about 18211.2042709976. The cubic root of 331647961 is about 692.1907274122.

The spelling of 331647961 in words is "three hundred thirty-one million, six hundred forty-seven thousand, nine hundred sixty-one".