82161601 has 2 divisors, whose sum is σ = 82161602. Its totient is φ = 82161600.

The previous prime is 82161577. The next prime is 82161613. The reversal of 82161601 is 10616128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73017025 + 9144576 = 8545^2 + 3024^2 .

It is a cyclic number.

It is not a de Polignac number, because 82161601 - 2⁷ = 82161473 is a prime.

It is not a weakly prime, because it can be changed into another prime (82161641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41080800 + 41080801.

It is an arithmetic number, because the mean of its divisors is an integer number (41080801).

Almost surely, 2^82161601 is an apocalyptic number.

It is an amenable number.

82161601 is a deficient number, since it is larger than the sum of its proper divisors (1).

82161601 is an equidigital number, since it uses as much as digits as its factorization.

82161601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 82161601 is about 9064.3036687878. The cubic root of 82161601 is about 434.7333566481.

Adding to 82161601 its reverse (10616128), we get a palindrome (92777729).

The spelling of 82161601 in words is "eighty-two million, one hundred sixty-one thousand, six hundred one".