82631971 has 4 divisors (see below), whose sum is σ = 83865352. Its totient is φ = 81398592.

The previous prime is 82631953. The next prime is 82631987. The reversal of 82631971 is 17913628.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82631971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82631971.

It is not an unprimeable number, because it can be changed into a prime (82631921) 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, 616590 + ... + 616723.

It is an arithmetic number, because the mean of its divisors is an integer number (20966338).

Almost surely, 2^82631971 is an apocalyptic number.

82631971 is a deficient number, since it is larger than the sum of its proper divisors (1233381).

82631971 is a wasteful number, since it uses less digits than its factorization.

82631971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233380.

The product of its digits is 18144, while the sum is 37.

The square root of 82631971 is about 9090.2129237989. The cubic root of 82631971 is about 435.5613855594.

The spelling of 82631971 in words is "eighty-two million, six hundred thirty-one thousand, nine hundred seventy-one".