523051891 has 4 divisors (see below), whose sum is σ = 523119400. Its totient is φ = 522984384.

The previous prime is 523051873. The next prime is 523051927. The reversal of 523051891 is 198150325.

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 523051891 - 2¹⁷ = 522920819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523051091) 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, 20361 + ... + 38218.

It is an arithmetic number, because the mean of its divisors is an integer number (130779850).

Almost surely, 2^523051891 is an apocalyptic number.

523051891 is a deficient number, since it is larger than the sum of its proper divisors (67509).

523051891 is an equidigital number, since it uses as much as digits as its factorization.

523051891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67508.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 523051891 is about 22870.3277414208. The cubic root of 523051891 is about 805.7152656703.

It can be divided in two parts, 5230 and 51891, that added together give a square (57121 = 239²).

The spelling of 523051891 in words is "five hundred twenty-three million, fifty-one thousand, eight hundred ninety-one".