31302120231 has 12 divisors (see below), whose sum is σ = 45225371152. Its totient is φ = 20862912096.

The previous prime is 31302120221. The next prime is 31302120259. The reversal of 31302120231 is 13202120313.

31302120231 is a `hidden beast` number, since 313 + 0 + 2 + 120 + 231 = 666.

It is not a de Polignac number, because 31302120231 - 2⁷ = 31302120103 is a prime.

It is a super-2 number, since 2×31302120231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302120221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392131 + ... + 465156.

Almost surely, 2^31302120231 is an apocalyptic number.

31302120231 is a deficient number, since it is larger than the sum of its proper divisors (13923250921).

31302120231 is a wasteful number, since it uses less digits than its factorization.

31302120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861350 (or 861347 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31302120231 its reverse (13202120313), we get a palindrome (44504240544).

The spelling of 31302120231 in words is "thirty-one billion, three hundred two million, one hundred twenty thousand, two hundred thirty-one".