31323013331 has 4 divisors (see below), whose sum is σ = 32971593000. Its totient is φ = 29674433664.

The previous prime is 31323013327. The next prime is 31323013333. The reversal of 31323013331 is 13331032313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13331032313 = 73 ⋅182616881.

It is a cyclic number.

It is not a de Polignac number, because 31323013331 - 2² = 31323013327 is a prime.

It is a super-2 number, since 2×31323013331² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323013297 and 31323013306.

It is not an unprimeable number, because it can be changed into a prime (31323013333) 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, 824289806 + ... + 824289843.

It is an arithmetic number, because the mean of its divisors is an integer number (8242898250).

Almost surely, 2^31323013331 is an apocalyptic number.

31323013331 is a deficient number, since it is larger than the sum of its proper divisors (1648579669).

31323013331 is a wasteful number, since it uses less digits than its factorization.

31323013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648579668.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 31323013331 its reverse (13331032313), we get a palindrome (44654045644).

The spelling of 31323013331 in words is "thirty-one billion, three hundred twenty-three million, thirteen thousand, three hundred thirty-one".