31648973 has 4 divisors (see below), whose sum is σ = 31668348. Its totient is φ = 31629600.

The previous prime is 31648933. The next prime is 31648987. The reversal of 31648973 is 37984613.

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 12482089 + 19166884 = 3533^2 + 4378^2 .

It is a cyclic number.

It is not a de Polignac number, because 31648973 - 2⁶ = 31648909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31648973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31648933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6986 + ... + 10587.

It is an arithmetic number, because the mean of its divisors is an integer number (7917087).

Almost surely, 2^31648973 is an apocalyptic number.

It is an amenable number.

31648973 is a deficient number, since it is larger than the sum of its proper divisors (19375).

31648973 is a wasteful number, since it uses less digits than its factorization.

31648973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19374.

The product of its digits is 108864, while the sum is 41.

The square root of 31648973 is about 5625.7419955060. The cubic root of 31648973 is about 316.3150632432.

The spelling of 31648973 in words is "thirty-one million, six hundred forty-eight thousand, nine hundred seventy-three".