531643963 has 2 divisors, whose sum is σ = 531643964. Its totient is φ = 531643962.

The previous prime is 531643949. The next prime is 531644021. The reversal of 531643963 is 369346135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531643963 - 2²⁵ = 498089531 is a prime.

It is not a weakly prime, because it can be changed into another prime (531643913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265821981 + 265821982.

It is an arithmetic number, because the mean of its divisors is an integer number (265821982).

Almost surely, 2^531643963 is an apocalyptic number.

531643963 is a deficient number, since it is larger than the sum of its proper divisors (1).

531643963 is an equidigital number, since it uses as much as digits as its factorization.

531643963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 40.

The square root of 531643963 is about 23057.4058167869. The cubic root of 531643963 is about 810.1031027626.

The spelling of 531643963 in words is "five hundred thirty-one million, six hundred forty-three thousand, nine hundred sixty-three".