82161615 has 16 divisors (see below), whose sum is σ = 131976288. Its totient is φ = 43646976.

The previous prime is 82161613. The next prime is 82161641. The reversal of 82161615 is 51616128.

It is not a de Polignac number, because 82161615 - 2¹ = 82161613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82161613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6802 + ... + 14511.

It is an arithmetic number, because the mean of its divisors is an integer number (8248518).

Almost surely, 2^82161615 is an apocalyptic number.

82161615 is a deficient number, since it is larger than the sum of its proper divisors (49814673).

82161615 is a wasteful number, since it uses less digits than its factorization.

82161615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21578.

The product of its digits is 2880, while the sum is 30.

The square root of 82161615 is about 9064.3044410479. The cubic root of 82161615 is about 434.7333813403.

The spelling of 82161615 in words is "eighty-two million, one hundred sixty-one thousand, six hundred fifteen".