82971281 has 4 divisors (see below), whose sum is σ = 86578752. Its totient is φ = 79363812.

The previous prime is 82971269. The next prime is 82971299. The reversal of 82971281 is 18217928.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82971281 - 2¹⁰ = 82970257 is a prime.

It is a super-2 number, since 2×82971281² = 13768466941561922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82971211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803701 + ... + 1803746.

It is an arithmetic number, because the mean of its divisors is an integer number (21644688).

Almost surely, 2^82971281 is an apocalyptic number.

It is an amenable number.

82971281 is a deficient number, since it is larger than the sum of its proper divisors (3607471).

82971281 is a wasteful number, since it uses less digits than its factorization.

82971281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607470.

The product of its digits is 16128, while the sum is 38.

The square root of 82971281 is about 9108.8572828868. The cubic root of 82971281 is about 436.1567503747.

The spelling of 82971281 in words is "eighty-two million, nine hundred seventy-one thousand, two hundred eighty-one".