331363661 has 4 divisors (see below), whose sum is σ = 331452924. Its totient is φ = 331274400.

The previous prime is 331363649. The next prime is 331363663. The reversal of 331363661 is 166363133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106213636 + 225150025 = 10306^2 + 15005^2 .

It is a cyclic number.

It is not a de Polignac number, because 331363661 - 2¹⁸ = 331101517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331363663) 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 in 3 ways as a sum of consecutive naturals, for example, 38810 + ... + 46571.

It is an arithmetic number, because the mean of its divisors is an integer number (82863231).

Almost surely, 2^331363661 is an apocalyptic number.

It is an amenable number.

331363661 is a deficient number, since it is larger than the sum of its proper divisors (89263).

331363661 is an equidigital number, since it uses as much as digits as its factorization.

331363661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89262.

The product of its digits is 17496, while the sum is 32.

The square root of 331363661 is about 18203.3969632044. The cubic root of 331363661 is about 691.9928809953.

The spelling of 331363661 in words is "three hundred thirty-one million, three hundred sixty-three thousand, six hundred sixty-one".