82141981 has 2 divisors, whose sum is σ = 82141982. Its totient is φ = 82141980.

The previous prime is 82141979. The next prime is 82142003. The reversal of 82141981 is 18914128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79816356 + 2325625 = 8934^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 82141981 - 2¹ = 82141979 is a prime.

It is a super-2 number, since 2×82141981² = 13494610085208722, which contains 22 as substring.

Together with 82141979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82141951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41070990 + 41070991.

It is an arithmetic number, because the mean of its divisors is an integer number (41070991).

Almost surely, 2^82141981 is an apocalyptic number.

It is an amenable number.

82141981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82141981 is an equidigital number, since it uses as much as digits as its factorization.

82141981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 34.

The square root of 82141981 is about 9063.2213368096. The cubic root of 82141981 is about 434.6987494537.

The spelling of 82141981 in words is "eighty-two million, one hundred forty-one thousand, nine hundred eighty-one".