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31250 = 256
BaseRepresentation
bin111101000010010
31120212102
413220102
52000000
6400402
7160052
oct75022
946772
1031250
112152a
1216102
13112bb
14b562
1593d5
hex7a12

31250 has 14 divisors (see below), whose sum is σ = 58593. Its totient is φ = 12500.

The previous prime is 31249. The next prime is 31253. The reversal of 31250 is 5213.

Adding to 31250 its reverse (5213), we get a palindrome (36463).

It can be divided in two parts, 31 and 250, that multiplied together give a triangular number (7750 = T124).

It can be written as a sum of positive squares in 4 ways, for example, as 5329 + 25921 = 73^2 + 161^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=125.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (31253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 6248 + ... + 6252.

31250 is a Friedman number, since it can be written as 10*5^(3+2), using all its digits and the basic arithmetic operations.

231250 is an apocalyptic number.

31250 is a deficient number, since it is larger than the sum of its proper divisors (27343).

31250 is an frugal number, since it uses more digits than its factorization.

31250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32 (or 7 counting only the distinct ones).

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

The square root of 31250 is about 176.7766952966. The cubic root of 31250 is about 31.4980262474.

The spelling of 31250 in words is "thirty-one thousand, two hundred fifty".

Divisors: 1 2 5 10 25 50 125 250 625 1250 3125 6250 15625 31250