82169987 has 2 divisors, whose sum is σ = 82169988. Its totient is φ = 82169986.

The previous prime is 82169951. The next prime is 82170019. The reversal of 82169987 is 78996128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82169987 - 2¹⁰ = 82168963 is a prime.

It is not a weakly prime, because it can be changed into another prime (82169387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41084993 + 41084994.

It is an arithmetic number, because the mean of its divisors is an integer number (41084994).

Almost surely, 2^82169987 is an apocalyptic number.

82169987 is a deficient number, since it is larger than the sum of its proper divisors (1).

82169987 is an equidigital number, since it uses as much as digits as its factorization.

82169987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 82169987 is about 9064.7662407808. The cubic root of 82169987 is about 434.7481468090.

The spelling of 82169987 in words is "eighty-two million, one hundred sixty-nine thousand, nine hundred eighty-seven".