82659781 has 2 divisors, whose sum is σ = 82659782. Its totient is φ = 82659780.

The previous prime is 82659761. The next prime is 82659791. The reversal of 82659781 is 18795628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 14861025 = 8234^2 + 3855^2 .

It is a cyclic number.

It is not a de Polignac number, because 82659781 - 2¹³ = 82651589 is a prime.

It is a super-2 number, since 2×82659781² = 13665278789935922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82659721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41329890 + 41329891.

It is an arithmetic number, because the mean of its divisors is an integer number (41329891).

Almost surely, 2^82659781 is an apocalyptic number.

It is an amenable number.

82659781 is a deficient number, since it is larger than the sum of its proper divisors (1).

82659781 is an equidigital number, since it uses as much as digits as its factorization.

82659781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 82659781 is about 9091.7424622566. The cubic root of 82659781 is about 435.6102431761.

The spelling of 82659781 in words is "eighty-two million, six hundred fifty-nine thousand, seven hundred eighty-one".