82161401 has 4 divisors (see below), whose sum is σ = 93898752. Its totient is φ = 70424052.

The previous prime is 82161389. The next prime is 82161407. The reversal of 82161401 is 10416128.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82161401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82161407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5868665 + ... + 5868678.

It is an arithmetic number, because the mean of its divisors is an integer number (23474688).

Almost surely, 2^82161401 is an apocalyptic number.

It is an amenable number.

82161401 is a deficient number, since it is larger than the sum of its proper divisors (11737351).

82161401 is a wasteful number, since it uses less digits than its factorization.

82161401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11737350.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 82161401 is about 9064.2926364940. The cubic root of 82161401 is about 434.7330039012.

Adding to 82161401 its reverse (10416128), we get a palindrome (92577529).

The spelling of 82161401 in words is "eighty-two million, one hundred sixty-one thousand, four hundred one".