31030000 has 100 divisors (see below), whose sum is σ = 78443640. Its totient is φ = 11872000.

The previous prime is 31029979. The next prime is 31030001. The reversal of 31030000 is 3013.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 289947 + ... + 290053.

Almost surely, 2^31030000 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 31030000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39221820).

31030000 is an abundant number, since it is smaller than the sum of its proper divisors (47413640).

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

31030000 is a wasteful number, since it uses less digits than its factorization.

31030000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 143 counting only the distinct ones).

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

The square root of 31030000 is about 5570.4577908822. The cubic root of 31030000 is about 314.2393674278.

Adding to 31030000 its reverse (3013), we get a palindrome (31033013).

The spelling of 31030000 in words is "thirty-one million, thirty thousand".