82121601 has 4 divisors (see below), whose sum is σ = 109495472. Its totient is φ = 54747732.

The previous prime is 82121597. The next prime is 82121603. The reversal of 82121601 is 10612128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 82121601 - 2² = 82121597 is a prime.

It is a Duffinian number.

It is a Curzon 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13686931 + ... + 13686936.

It is an arithmetic number, because the mean of its divisors is an integer number (27373868).

Almost surely, 2^82121601 is an apocalyptic number.

It is an amenable number.

82121601 is a deficient number, since it is larger than the sum of its proper divisors (27373871).

82121601 is a wasteful number, since it uses less digits than its factorization.

82121601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27373870.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 82121601 is about 9062.0969427611. The cubic root of 82121601 is about 434.6627958800.

Adding to 82121601 its reverse (10612128), we get a palindrome (92733729).

It can be divided in two parts, 821 and 21601, that added together give a palindrome (22422).

The spelling of 82121601 in words is "eighty-two million, one hundred twenty-one thousand, six hundred one".