31875973 has 4 divisors (see below), whose sum is σ = 32234220. Its totient is φ = 31517728.

The previous prime is 31875937. The next prime is 31875997. The reversal of 31875973 is 37957813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 14386849 = 4182^2 + 3793^2 .

It is a cyclic number.

It is not a de Polignac number, because 31875973 - 2¹⁷ = 31744901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31875923) 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 3 ways as a sum of consecutive naturals, for example, 178990 + ... + 179167.

It is an arithmetic number, because the mean of its divisors is an integer number (8058555).

Almost surely, 2^31875973 is an apocalyptic number.

It is an amenable number.

31875973 is a deficient number, since it is larger than the sum of its proper divisors (358247).

31875973 is an equidigital number, since it uses as much as digits as its factorization.

31875973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358246.

The product of its digits is 158760, while the sum is 43.

The square root of 31875973 is about 5645.8810649889. The cubic root of 31875973 is about 317.0695114377.

The spelling of 31875973 in words is "thirty-one million, eight hundred seventy-five thousand, nine hundred seventy-three".