31321122231 has 8 divisors (see below), whose sum is σ = 47727424384. Its totient is φ = 17897784120.

The previous prime is 31321122187. The next prime is 31321122233. The reversal of 31321122231 is 13222112313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31321122231 - 2⁷ = 31321122103 is a prime.

It is a super-2 number, since 2×31321122231² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1491482011 = 31321122231 / (3 + 1 + 3 + 2 + 1 + 1 + 2 + 2 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321122198 and 31321122207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321122233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745740985 + ... + 745741026.

It is an arithmetic number, because the mean of its divisors is an integer number (5965928048).

Almost surely, 2^31321122231 is an apocalyptic number.

31321122231 is a deficient number, since it is larger than the sum of its proper divisors (16406302153).

31321122231 is a wasteful number, since it uses less digits than its factorization.

31321122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491482021.

The product of its digits is 432, while the sum is 21.

Adding to 31321122231 its reverse (13222112313), we get a palindrome (44543234544).

The spelling of 31321122231 in words is "thirty-one billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred thirty-one".