8320213531 has 4 divisors (see below), whose sum is σ = 9508815472. Its totient is φ = 7131611592.

The previous prime is 8320213483. The next prime is 8320213537. The reversal of 8320213531 is 1353120238.

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

It is not a de Polignac number, because 8320213531 - 2¹¹ = 8320211483 is a prime.

It is a super-2 number, since 2×8320213531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8320213531.

It is not an unprimeable number, because it can be changed into a prime (8320213537) 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, 594300960 + ... + 594300973.

It is an arithmetic number, because the mean of its divisors is an integer number (2377203868).

Almost surely, 2^8320213531 is an apocalyptic number.

8320213531 is a deficient number, since it is larger than the sum of its proper divisors (1188601941).

8320213531 is a wasteful number, since it uses less digits than its factorization.

8320213531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188601940.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 8320213531 is about 91215.2044946455. The cubic root of 8320213531 is about 2026.3361425033.

Adding to 8320213531 its reverse (1353120238), we get a palindrome (9673333769).

The spelling of 8320213531 in words is "eight billion, three hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".