320551042531 has 4 divisors (see below), whose sum is σ = 323855692552. Its totient is φ = 317246392512.

The previous prime is 320551042517. The next prime is 320551042549. The reversal of 320551042531 is 135240155023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135240155023 = 1879 ⋅71974537.

It is a cyclic number.

It is not a de Polignac number, because 320551042531 - 2¹⁷ = 320550911459 is a prime.

It is a super-2 number, since 2×320551042531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320551042493 and 320551042502.

It is not an unprimeable number, because it can be changed into a prime (320551042561) 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, 1652324865 + ... + 1652325058.

It is an arithmetic number, because the mean of its divisors is an integer number (80963923138).

Almost surely, 2^320551042531 is an apocalyptic number.

320551042531 is a deficient number, since it is larger than the sum of its proper divisors (3304650021).

320551042531 is an equidigital number, since it uses as much as digits as its factorization.

320551042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304650020.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 320551042531 its reverse (135240155023), we get a palindrome (455791197554).

The spelling of 320551042531 in words is "three hundred twenty billion, five hundred fifty-one million, forty-two thousand, five hundred thirty-one".