531643948091 has 4 divisors (see below), whose sum is σ = 538373618400. Its totient is φ = 524914277784.

The previous prime is 531643948079. The next prime is 531643948163. The reversal of 531643948091 is 190849346135.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531643948091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531643948051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3364835036 + ... + 3364835193.

It is an arithmetic number, because the mean of its divisors is an integer number (134593404600).

Almost surely, 2^531643948091 is an apocalyptic number.

531643948091 is a deficient number, since it is larger than the sum of its proper divisors (6729670309).

531643948091 is an equidigital number, since it uses as much as digits as its factorization.

531643948091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6729670308.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 531643948091 in words is "five hundred thirty-one billion, six hundred forty-three million, nine hundred forty-eight thousand, ninety-one".