31871345 has 32 divisors (see below), whose sum is σ = 44789760. Its totient is φ = 21514240.

The previous prime is 31871327. The next prime is 31871347. The reversal of 31871345 is 54317813.

It is not a de Polignac number, because 31871345 - 2⁸ = 31871089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31871347) 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 31 ways as a sum of consecutive naturals, for example, 83024 + ... + 83406.

It is an arithmetic number, because the mean of its divisors is an integer number (1399680).

Almost surely, 2^31871345 is an apocalyptic number.

It is an amenable number.

31871345 is a deficient number, since it is larger than the sum of its proper divisors (12918415).

31871345 is a wasteful number, since it uses less digits than its factorization.

31871345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 10080, while the sum is 32.

The square root of 31871345 is about 5645.4711937977. The cubic root of 31871345 is about 317.0541658280.

The spelling of 31871345 in words is "thirty-one million, eight hundred seventy-one thousand, three hundred forty-five".