31478971 has 8 divisors (see below), whose sum is σ = 32541680. Its totient is φ = 30427488.

The previous prime is 31478969. The next prime is 31478983. The reversal of 31478971 is 17987413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31478971 - 2¹ = 31478969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31478911) 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 7 ways as a sum of consecutive naturals, for example, 3100 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (4067710).

Almost surely, 2^31478971 is an apocalyptic number.

31478971 is a deficient number, since it is larger than the sum of its proper divisors (1062709).

31478971 is a wasteful number, since it uses less digits than its factorization.

31478971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613.

The product of its digits is 42336, while the sum is 40.

The square root of 31478971 is about 5610.6123551712. The cubic root of 31478971 is about 315.7476855470.

The spelling of 31478971 in words is "thirty-one million, four hundred seventy-eight thousand, nine hundred seventy-one".