82551709 has 2 divisors, whose sum is σ = 82551710. Its totient is φ = 82551708.

The previous prime is 82551673. The next prime is 82551739. The reversal of 82551709 is 90715528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51079609 + 31472100 = 7147^2 + 5610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82551709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82551739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41275854 + 41275855.

It is an arithmetic number, because the mean of its divisors is an integer number (41275855).

Almost surely, 2^82551709 is an apocalyptic number.

It is an amenable number.

82551709 is a deficient number, since it is larger than the sum of its proper divisors (1).

82551709 is an equidigital number, since it uses as much as digits as its factorization.

82551709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 82551709 is about 9085.7971031715. The cubic root of 82551709 is about 435.4203168649.

The spelling of 82551709 in words is "eighty-two million, five hundred fifty-one thousand, seven hundred nine".