531821023 has 4 divisors (see below), whose sum is σ = 532689208. Its totient is φ = 530952840.

The previous prime is 531821021. The next prime is 531821029. The reversal of 531821023 is 320128135.

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 531821023 - 2¹ = 531821021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531821021) 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, 433173 + ... + 434398.

It is an arithmetic number, because the mean of its divisors is an integer number (133172302).

Almost surely, 2^531821023 is an apocalyptic number.

531821023 is a deficient number, since it is larger than the sum of its proper divisors (868185).

531821023 is an equidigital number, since it uses as much as digits as its factorization.

531821023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868184.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 531821023 is about 23061.2450444463. The cubic root of 531821023 is about 810.1930256839.

Adding to 531821023 its reverse (320128135), we get a palindrome (851949158).

The spelling of 531821023 in words is "five hundred thirty-one million, eight hundred twenty-one thousand, twenty-three".