82121613 has 8 divisors (see below), whose sum is σ = 125137728. Its totient is φ = 46926624.

The previous prime is 82121603. The next prime is 82121623. The reversal of 82121613 is 31612128.

It is an interprime number because it is at equal distance from previous prime (82121603) and next prime (82121623).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82121613 - 2⁴ = 82121597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955256 + ... + 1955297.

It is an arithmetic number, because the mean of its divisors is an integer number (15642216).

Almost surely, 2^82121613 is an apocalyptic number.

It is an amenable number.

82121613 is a deficient number, since it is larger than the sum of its proper divisors (43016115).

82121613 is a wasteful number, since it uses less digits than its factorization.

82121613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910563.

The product of its digits is 576, while the sum is 24.

The square root of 82121613 is about 9062.0976048595. The cubic root of 82121613 is about 434.6628170517.

The spelling of 82121613 in words is "eighty-two million, one hundred twenty-one thousand, six hundred thirteen".