82625981 has 2 divisors, whose sum is σ = 82625982. Its totient is φ = 82625980.

The previous prime is 82625969. The next prime is 82625989. The reversal of 82625981 is 18952628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 4020025 = 8866^2 + 2005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82625981 is a prime.

It is a super-2 number, since 2×82625981² = 13654105472424722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82625989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41312990 + 41312991.

It is an arithmetic number, because the mean of its divisors is an integer number (41312991).

Almost surely, 2^82625981 is an apocalyptic number.

It is an amenable number.

82625981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82625981 is an equidigital number, since it uses as much as digits as its factorization.

82625981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 82625981 is about 9089.8834425971. The cubic root of 82625981 is about 435.5508606753.

The spelling of 82625981 in words is "eighty-two million, six hundred twenty-five thousand, nine hundred eighty-one".