331412561 has 2 divisors, whose sum is σ = 331412562. Its totient is φ = 331412560.

The previous prime is 331412533. The next prime is 331412591. The reversal of 331412561 is 165214133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280361536 + 51051025 = 16744^2 + 7145^2 .

It is a cyclic number.

It is not a de Polignac number, because 331412561 - 2²² = 327218257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331412561.

It is not a weakly prime, because it can be changed into another prime (331412591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165706280 + 165706281.

It is an arithmetic number, because the mean of its divisors is an integer number (165706281).

Almost surely, 2^331412561 is an apocalyptic number.

It is an amenable number.

331412561 is a deficient number, since it is larger than the sum of its proper divisors (1).

331412561 is an equidigital number, since it uses as much as digits as its factorization.

331412561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 331412561 is about 18204.7400695533. The cubic root of 331412561 is about 692.0269189134.

Adding to 331412561 its reverse (165214133), we get a palindrome (496626694).

The spelling of 331412561 in words is "three hundred thirty-one million, four hundred twelve thousand, five hundred sixty-one".