31986071 has 4 divisors (see below), whose sum is σ = 34446552. Its totient is φ = 29525592.

The previous prime is 31986067. The next prime is 31986091. The reversal of 31986071 is 17068913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31986071 - 2² = 31986067 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31986091) 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, 1230221 + ... + 1230246.

It is an arithmetic number, because the mean of its divisors is an integer number (8611638).

Almost surely, 2^31986071 is an apocalyptic number.

31986071 is a deficient number, since it is larger than the sum of its proper divisors (2460481).

31986071 is a wasteful number, since it uses less digits than its factorization.

31986071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460480.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 31986071 is about 5655.6229541935. The cubic root of 31986071 is about 317.4341393141.

The spelling of 31986071 in words is "thirty-one million, nine hundred eighty-six thousand, seventy-one".