321624661 has 2 divisors, whose sum is σ = 321624662. Its totient is φ = 321624660.

The previous prime is 321624613. The next prime is 321624671. The reversal of 321624661 is 166426123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267322500 + 54302161 = 16350^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 321624661 - 2¹⁷ = 321493589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321624671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160812330 + 160812331.

It is an arithmetic number, because the mean of its divisors is an integer number (160812331).

Almost surely, 2^321624661 is an apocalyptic number.

It is an amenable number.

321624661 is a deficient number, since it is larger than the sum of its proper divisors (1).

321624661 is an equidigital number, since it uses as much as digits as its factorization.

321624661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 321624661 is about 17933.8969830876. The cubic root of 321624661 is about 685.1459798637.

The spelling of 321624661 in words is "three hundred twenty-one million, six hundred twenty-four thousand, six hundred sixty-one".