331221652 has 6 divisors (see below), whose sum is σ = 579637898. Its totient is φ = 165610824.

The previous prime is 331221637. The next prime is 331221691. The reversal of 331221652 is 256122133.

It can be written as a sum of positive squares in only one way, i.e., 325297296 + 5924356 = 18036^2 + 2434^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41402703 + ... + 41402710.

Almost surely, 2^331221652 is an apocalyptic number.

It is an amenable number.

331221652 is a deficient number, since it is larger than the sum of its proper divisors (248416246).

331221652 is a wasteful number, since it uses less digits than its factorization.

331221652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82805417 (or 82805415 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 331221652 is about 18199.4959270855. The cubic root of 331221652 is about 691.8940135273.

Adding to 331221652 its reverse (256122133), we get a palindrome (587343785).

It can be divided in two parts, 3312 and 21652, that added together give a square (24964 = 158²).

The spelling of 331221652 in words is "three hundred thirty-one million, two hundred twenty-one thousand, six hundred fifty-two".