3231521 has 2 divisors, whose sum is σ = 3231522. Its totient is φ = 3231520.

The previous prime is 3231517. The next prime is 3231541. The reversal of 3231521 is 1251323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2676496 + 555025 = 1636^2 + 745^2 .

It is an emirp because it is prime and its reverse (1251323) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3231521 - 2² = 3231517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3231521.

It is not a weakly prime, because it can be changed into another prime (3231511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1615760 + 1615761.

It is an arithmetic number, because the mean of its divisors is an integer number (1615761).

Almost surely, 2^3231521 is an apocalyptic number.

It is an amenable number.

3231521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3231521 is an equidigital number, since it uses as much as digits as its factorization.

3231521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 17.

The square root of 3231521 is about 1797.6431792767. The cubic root of 3231521 is about 147.8435313737.

Adding to 3231521 its reverse (1251323), we get a palindrome (4482844).

The spelling of 3231521 in words is "three million, two hundred thirty-one thousand, five hundred twenty-one".