31300000 has 72 divisors (see below), whose sum is σ = 77268492. Its totient is φ = 12480000.

The previous prime is 31299997. The next prime is 31300007. The reversal of 31300000 is 313.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13220496 + 18079504 = 3636^2 + 4252^2 .

It is not an unprimeable number, because it can be changed into a prime (31300007) 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 11 ways as a sum of consecutive naturals, for example, 99844 + ... + 100156.

Almost surely, 2^31300000 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 31300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38634246).

31300000 is an abundant number, since it is smaller than the sum of its proper divisors (45968492).

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

31300000 is an frugal number, since it uses more digits than its factorization.

31300000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 7.

The square root of 31300000 is about 5594.6402922797. The cubic root of 31300000 is about 315.1481624322.

Adding to 31300000 its reverse (313), we get a palindrome (31300313).

31300000 divided by its reverse (313) gives a 5-th power (100000 = 10⁵).

The spelling of 31300000 in words is "thirty-one million, three hundred thousand".