82642981 has 2 divisors, whose sum is σ = 82642982. Its totient is φ = 82642980.

The previous prime is 82642969. The next prime is 82642991. The reversal of 82642981 is 18924628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 34409956 = 6945^2 + 5866^2 .

It is a cyclic number.

It is not a de Polignac number, because 82642981 - 2⁷ = 82642853 is a prime.

It is a super-2 number, since 2×82642981² = 13659724617132722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82642991) 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 as a sum of consecutive naturals, namely, 41321490 + 41321491.

It is an arithmetic number, because the mean of its divisors is an integer number (41321491).

Almost surely, 2^82642981 is an apocalyptic number.

It is an amenable number.

82642981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82642981 is an equidigital number, since it uses as much as digits as its factorization.

82642981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 82642981 is about 9090.8185000032. The cubic root of 82642981 is about 435.5807296374.

The spelling of 82642981 in words is "eighty-two million, six hundred forty-two thousand, nine hundred eighty-one".