31125450 has 48 divisors (see below), whose sum is σ = 78521760. Its totient is φ = 8157120.

The previous prime is 31125449. The next prime is 31125461. The reversal of 31125450 is 5452113.

It is a super-4 number, since 4×31125450⁴ (a number of 31 digits) contains 4444 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7092 + ... + 10608.

It is an arithmetic number, because the mean of its divisors is an integer number (1635870).

Almost surely, 2^31125450 is an apocalyptic number.

31125450 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31125450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39260880).

31125450 is an abundant number, since it is smaller than the sum of its proper divisors (47396310).

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

31125450 is a wasteful number, since it uses less digits than its factorization.

31125450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591 (or 3586 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 31125450 is about 5579.0187309239. The cubic root of 31125450 is about 314.5612435210.

Adding to 31125450 its reverse (5452113), we get a palindrome (36577563).

The spelling of 31125450 in words is "thirty-one million, one hundred twenty-five thousand, four hundred fifty".