82161473 has 2 divisors, whose sum is σ = 82161474. Its totient is φ = 82161472.

The previous prime is 82161467. The next prime is 82161487. The reversal of 82161473 is 37416128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79780624 + 2380849 = 8932^2 + 1543^2 .

It is a cyclic number.

It is not a de Polignac number, because 82161473 - 2²⁰ = 81112897 is a prime.

It is not a weakly prime, because it can be changed into another prime (82161173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41080736 + 41080737.

It is an arithmetic number, because the mean of its divisors is an integer number (41080737).

Almost surely, 2^82161473 is an apocalyptic number.

It is an amenable number.

82161473 is a deficient number, since it is larger than the sum of its proper divisors (1).

82161473 is an equidigital number, since it uses as much as digits as its factorization.

82161473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 82161473 is about 9064.2966081213. The cubic root of 82161473 is about 434.7331308901.

The spelling of 82161473 in words is "eighty-two million, one hundred sixty-one thousand, four hundred seventy-three".