331622261 has 2 divisors, whose sum is σ = 331622262. Its totient is φ = 331622260.

The previous prime is 331622237. The next prime is 331622287. The reversal of 331622261 is 162226133.

It is an a-pointer prime, because the next prime (331622287) can be obtained adding 331622261 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331021636 + 600625 = 18194^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 331622261 - 2⁶ = 331622197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 331622261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331624261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165811130 + 165811131.

It is an arithmetic number, because the mean of its divisors is an integer number (165811131).

Almost surely, 2^331622261 is an apocalyptic number.

It is an amenable number.

331622261 is a deficient number, since it is larger than the sum of its proper divisors (1).

331622261 is an equidigital number, since it uses as much as digits as its factorization.

331622261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 331622261 is about 18210.4986477581. The cubic root of 331622261 is about 692.1728472468.

Adding to 331622261 its reverse (162226133), we get a palindrome (493848394).

The spelling of 331622261 in words is "three hundred thirty-one million, six hundred twenty-two thousand, two hundred sixty-one".