531050320091 has 4 divisors (see below), whose sum is σ = 562288574232. Its totient is φ = 499812065952.

The previous prime is 531050320079. The next prime is 531050320111. The reversal of 531050320091 is 190023050135.

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-531050320091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531050320001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15619127045 + ... + 15619127078.

It is an arithmetic number, because the mean of its divisors is an integer number (140572143558).

Almost surely, 2^531050320091 is an apocalyptic number.

531050320091 is a deficient number, since it is larger than the sum of its proper divisors (31238254141).

531050320091 is a wasteful number, since it uses less digits than its factorization.

531050320091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31238254140.

The product of its (nonzero) digits is 4050, while the sum is 29.

The spelling of 531050320091 in words is "five hundred thirty-one billion, fifty million, three hundred twenty thousand, ninety-one".