31520352331331 has 4 divisors (see below), whose sum is σ = 31530990320232. Its totient is φ = 31509714342432.

The previous prime is 31520352331241. The next prime is 31520352331333. The reversal of 31520352331331 is 13313325302513.

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 31520352331331 - 2²² = 31520348137027 is a prime.

It is a super-2 number, since 2×31520352331331² (a number of 28 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 = 31520352331291 and 31520352331300.

It is not an unprimeable number, because it can be changed into a prime (31520352331333) 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, 5318990006 + ... + 5318995931.

It is an arithmetic number, because the mean of its divisors is an integer number (7882747580058).

Almost surely, 2^{31520352331331} is an apocalyptic number.

31520352331331 is a deficient number, since it is larger than the sum of its proper divisors (10637988901).

31520352331331 is a wasteful number, since it uses less digits than its factorization.

31520352331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10637988900.

The product of its (nonzero) digits is 72900, while the sum is 35.

Adding to 31520352331331 its reverse (13313325302513), we get a palindrome (44833677633844).

The spelling of 31520352331331 in words is "thirty-one trillion, five hundred twenty billion, three hundred fifty-two million, three hundred thirty-one thousand, three hundred thirty-one".