31250000 has 50 divisors (see below), whose sum is σ = 75683586. Its totient is φ = 12500000.

The previous prime is 31249997. The next prime is 31250017. The reversal of 31250000 is 5213.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 8248384 + 23001616 = 2872^2 + 4796^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a nialpdrome in base 5.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 6249998 + ... + 6250002.

Almost surely, 2^31250000 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 31250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37841793).

31250000 is an abundant number, since it is smaller than the sum of its proper divisors (44433586).

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

31250000 is an frugal number, since it uses more digits than its factorization.

31250000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 31250000 is about 5590.1699437495. The cubic root of 31250000 is about 314.9802624737.

Adding to 31250000 its reverse (5213), we get a palindrome (31255213).

The spelling of 31250000 in words is "thirty-one million, two hundred fifty thousand".