82171519 has 2 divisors, whose sum is σ = 82171520. Its totient is φ = 82171518.

The previous prime is 82171511. The next prime is 82171541. The reversal of 82171519 is 91517128.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82171519 - 2³ = 82171511 is a prime.

It is a super-2 number, since 2×82171519² = 13504317069534722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82171511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41085759 + 41085760.

It is an arithmetic number, because the mean of its divisors is an integer number (41085760).

Almost surely, 2^82171519 is an apocalyptic number.

82171519 is a deficient number, since it is larger than the sum of its proper divisors (1).

82171519 is an equidigital number, since it uses as much as digits as its factorization.

82171519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 82171519 is about 9064.8507433934. The cubic root of 82171519 is about 434.7508486471.

The spelling of 82171519 in words is "eighty-two million, one hundred seventy-one thousand, five hundred nineteen".