31031231000 has 128 divisors (see below), whose sum is σ = 90530818560. Its totient is φ = 9672048000.

The previous prime is 31031230957. The next prime is 31031231009. The reversal of 31031231000 is 13213013.

It is a super-2 number, since 2×31031231000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031231009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124502 + ... + 278501.

It is an arithmetic number, because the mean of its divisors is an integer number (707272020).

Almost surely, 2^31031231000 is an apocalyptic number.

It is an amenable number.

31031231000 is an abundant number, since it is smaller than the sum of its proper divisors (59499587560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31031231000 is a wasteful number, since it uses less digits than its factorization.

31031231000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403042 (or 403028 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31031231000 its reverse (13213013), we get a palindrome (31044444013).

The spelling of 31031231000 in words is "thirty-one billion, thirty-one million, two hundred thirty-one thousand".