531320623 has 4 divisors (see below), whose sum is σ = 534017880. Its totient is φ = 528623368.

The previous prime is 531320611. The next prime is 531320627. The reversal of 531320623 is 326023135.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326023135 = 5 ⋅65204627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531320623 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 (531320627) 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, 1348333 + ... + 1348726.

It is an arithmetic number, because the mean of its divisors is an integer number (133504470).

Almost surely, 2^531320623 is an apocalyptic number.

531320623 is a deficient number, since it is larger than the sum of its proper divisors (2697257).

531320623 is a wasteful number, since it uses less digits than its factorization.

531320623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697256.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 531320623 is about 23050.3931202919. The cubic root of 531320623 is about 809.9388375298.

Adding to 531320623 its reverse (326023135), we get a palindrome (857343758).

The spelling of 531320623 in words is "five hundred thirty-one million, three hundred twenty thousand, six hundred twenty-three".