31031230131 has 24 divisors (see below), whose sum is σ = 49100628720. Its totient is φ = 18728755200.

The previous prime is 31031230117. The next prime is 31031230157. The reversal of 31031230131 is 13103213013.

It is a happy number.

31031230131 is a `hidden beast` number, since 310 + 312 + 30 + 13 + 1 = 666.

It is not a de Polignac number, because 31031230131 - 2¹⁹ = 31030705843 is a prime.

It is a super-2 number, since 2×31031230131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31031230171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 626446 + ... + 674163.

It is an arithmetic number, because the mean of its divisors is an integer number (2045859530).

Almost surely, 2^31031230131 is an apocalyptic number.

31031230131 is a deficient number, since it is larger than the sum of its proper divisors (18069398589).

31031230131 is a wasteful number, since it uses less digits than its factorization.

31031230131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300867 (or 1300864 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31031230131 its reverse (13103213013), we get a palindrome (44134443144).

It can be divided in two parts, 31031 and 230131, that added together give a palindrome (261162).

The spelling of 31031230131 in words is "thirty-one billion, thirty-one million, two hundred thirty thousand, one hundred thirty-one".