816100061 has 4 divisors (see below), whose sum is σ = 932685792. Its totient is φ = 699514332.

The previous prime is 816100013. The next prime is 816100063. The reversal of 816100061 is 160001618.

It is a happy number.

816100061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 816100061 - 2¹⁸ = 815837917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816100063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58292855 + ... + 58292868.

It is an arithmetic number, because the mean of its divisors is an integer number (233171448).

Almost surely, 2^816100061 is an apocalyptic number.

It is an amenable number.

816100061 is a deficient number, since it is larger than the sum of its proper divisors (116585731).

816100061 is a wasteful number, since it uses less digits than its factorization.

816100061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116585730.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 816100061 is about 28567.4650783019. The cubic root of 816100061 is about 934.5039400155.

Adding to 816100061 its reverse (160001618), we get a palindrome (976101679).

The spelling of 816100061 in words is "eight hundred sixteen million, one hundred thousand, sixty-one".