31140500 has 48 divisors (see below), whose sum is σ = 69193488. Its totient is φ = 12240000.

The previous prime is 31140497. The next prime is 31140503. The reversal of 31140500 is 504113.

It is an interprime number because it is at equal distance from previous prime (31140497) and next prime (31140503).

It can be written as a sum of positive squares in 8 ways, for example, as 18079504 + 13060996 = 4252^2 + 3614^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29990 + ... + 31010.

It is an arithmetic number, because the mean of its divisors is an integer number (1441531).

Almost surely, 2^31140500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31140500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34596744).

31140500 is an abundant number, since it is smaller than the sum of its proper divisors (38052988).

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

31140500 is a wasteful number, since it uses less digits than its factorization.

31140500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 31140500 is about 5580.3673714192. The cubic root of 31140500 is about 314.6119349851.

Adding to 31140500 its reverse (504113), we get a palindrome (31644613).

The spelling of 31140500 in words is "thirty-one million, one hundred forty thousand, five hundred".