31971361 has 8 divisors (see below), whose sum is σ = 32394240. Its totient is φ = 31551408.

The previous prime is 31971341. The next prime is 31971383. The reversal of 31971361 is 16317913.

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 31971361 - 2¹⁵ = 31938593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31971341) 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, 28275 + ... + 29383.

It is an arithmetic number, because the mean of its divisors is an integer number (4049280).

Almost surely, 2^31971361 is an apocalyptic number.

It is an amenable number.

31971361 is a deficient number, since it is larger than the sum of its proper divisors (422879).

31971361 is a wasteful number, since it uses less digits than its factorization.

31971361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its digits is 3402, while the sum is 31.

The square root of 31971361 is about 5654.3223289798. The cubic root of 31971361 is about 317.3854705026.

The spelling of 31971361 in words is "thirty-one million, nine hundred seventy-one thousand, three hundred sixty-one".