523000891 has 4 divisors (see below), whose sum is σ = 597715312. Its totient is φ = 448286472.

The previous prime is 523000889. The next prime is 523000901. The reversal of 523000891 is 198000325.

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

It is a cyclic number.

It is not a de Polignac number, because 523000891 - 2¹ = 523000889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523000091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37357200 + ... + 37357213.

It is an arithmetic number, because the mean of its divisors is an integer number (149428828).

Almost surely, 2^523000891 is an apocalyptic number.

523000891 is a deficient number, since it is larger than the sum of its proper divisors (74714421).

523000891 is an equidigital number, since it uses as much as digits as its factorization.

523000891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74714420.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 523000891 is about 22869.2127324051. The cubic root of 523000891 is about 805.6890778198.

The spelling of 523000891 in words is "five hundred twenty-three million, eight hundred ninety-one", and thus it is an aban number.