9643531 has 2 divisors, whose sum is σ = 9643532. Its totient is φ = 9643530.

The previous prime is 9643493. The next prime is 9643537. The reversal of 9643531 is 1353469.

9643531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9643531 is a prime.

It is a super-2 number, since 2×9643531² = 185995380295922, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 9643493 and 9643502.

It is not a weakly prime, because it can be changed into another prime (9643537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4821765 + 4821766.

It is an arithmetic number, because the mean of its divisors is an integer number (4821766).

Almost surely, 2^9643531 is an apocalyptic number.

9643531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9643531 is an equidigital number, since it uses as much as digits as its factorization.

9643531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 9643531 is about 3105.4035164532. The cubic root of 9643531 is about 212.8524697132.

The spelling of 9643531 in words is "nine million, six hundred forty-three thousand, five hundred thirty-one".