31320420231 has 8 divisors (see below), whose sum is σ = 41761381120. Its totient is φ = 20879869752.

The previous prime is 31320420221. The next prime is 31320420233. The reversal of 31320420231 is 13202402313.

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

It is not a de Polignac number, because 31320420231 - 2⁹ = 31320419719 is a prime.

It is a super-2 number, since 2×31320420231² (a number of 22 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 = 31320420198 and 31320420207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320420233) 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, 223890 + ... + 335808.

It is an arithmetic number, because the mean of its divisors is an integer number (5220172640).

Almost surely, 2^31320420231 is an apocalyptic number.

31320420231 is a deficient number, since it is larger than the sum of its proper divisors (10440960889).

31320420231 is a wasteful number, since it uses less digits than its factorization.

31320420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205205.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31320420231 its reverse (13202402313), we get a palindrome (44522822544).

The spelling of 31320420231 in words is "thirty-one billion, three hundred twenty million, four hundred twenty thousand, two hundred thirty-one".