3221531623 has 2 divisors, whose sum is σ = 3221531624. Its totient is φ = 3221531622.

The previous prime is 3221531597. The next prime is 3221531641. The reversal of 3221531623 is 3261351223.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3221531623 - 2¹⁷ = 3221400551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3221531591 and 3221531600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221531923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610765811 + 1610765812.

It is an arithmetic number, because the mean of its divisors is an integer number (1610765812).

Almost surely, 2^3221531623 is an apocalyptic number.

3221531623 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221531623 is an equidigital number, since it uses as much as digits as its factorization.

3221531623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 3221531623 is about 56758.5378863832. The cubic root of 3221531623 is about 1476.9103464260.

Adding to 3221531623 its reverse (3261351223), we get a palindrome (6482882846).

The spelling of 3221531623 in words is "three billion, two hundred twenty-one million, five hundred thirty-one thousand, six hundred twenty-three".