31323231001031 has 4 divisors (see below), whose sum is σ = 31348309650000. Its totient is φ = 31298152352064.

The previous prime is 31323231001009. The next prime is 31323231001039. The reversal of 31323231001031 is 13010013232313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323231001031 is a prime.

It is a super-2 number, since 2×31323231001031² (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 = 31323231000988 and 31323231001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323231001039) 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, 12539322611 + ... + 12539325108.

It is an arithmetic number, because the mean of its divisors is an integer number (7837077412500).

Almost surely, 2^{31323231001031} is an apocalyptic number.

31323231001031 is a deficient number, since it is larger than the sum of its proper divisors (25078648969).

31323231001031 is a wasteful number, since it uses less digits than its factorization.

31323231001031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25078648968.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31323231001031 its reverse (13010013232313), we get a palindrome (44333244233344).

The spelling of 31323231001031 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred thirty-one million, one thousand, thirty-one".