31872473 has 2 divisors, whose sum is σ = 31872474. Its totient is φ = 31872472.

The previous prime is 31872461. The next prime is 31872497. The reversal of 31872473 is 37427813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31393609 + 478864 = 5603^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 31872473 - 2⁶ = 31872409 is a prime.

It is a super-3 number, since 3×31872473³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31872403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15936236 + 15936237.

It is an arithmetic number, because the mean of its divisors is an integer number (15936237).

Almost surely, 2^31872473 is an apocalyptic number.

It is an amenable number.

31872473 is a deficient number, since it is larger than the sum of its proper divisors (1).

31872473 is an equidigital number, since it uses as much as digits as its factorization.

31872473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 31872473 is about 5645.5710960008. The cubic root of 31872473 is about 317.0579062086.

The spelling of 31872473 in words is "thirty-one million, eight hundred seventy-two thousand, four hundred seventy-three".