31873971 has 4 divisors (see below), whose sum is σ = 42498632. Its totient is φ = 21249312.

The previous prime is 31873949. The next prime is 31873979. The reversal of 31873971 is 17937813.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17937813 = 3 ⋅5979271.

It is not a de Polignac number, because 31873971 - 2¹⁵ = 31841203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31873979) 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, 5312326 + ... + 5312331.

It is an arithmetic number, because the mean of its divisors is an integer number (10624658).

Almost surely, 2^31873971 is an apocalyptic number.

31873971 is a deficient number, since it is larger than the sum of its proper divisors (10624661).

31873971 is a wasteful number, since it uses less digits than its factorization.

31873971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10624660.

The product of its digits is 31752, while the sum is 39.

The square root of 31873971 is about 5645.7037648109. The cubic root of 31873971 is about 317.0628733506.

The spelling of 31873971 in words is "thirty-one million, eight hundred seventy-three thousand, nine hundred seventy-one".