861382220101 has 4 divisors (see below), whose sum is σ = 927642390892. Its totient is φ = 795122049312.

The previous prime is 861382220093. The next prime is 861382220131. The reversal of 861382220101 is 101022283168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 498527784225 + 362854435876 = 706065^2 + 602374^2 .

It is a cyclic number.

It is not a de Polignac number, because 861382220101 - 2³ = 861382220093 is a prime.

It is a super-2 number, since 2×861382220101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861382220131) 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, 33130085376 + ... + 33130085401.

It is an arithmetic number, because the mean of its divisors is an integer number (231910597723).

Almost surely, 2^861382220101 is an apocalyptic number.

It is an amenable number.

861382220101 is a deficient number, since it is larger than the sum of its proper divisors (66260170791).

861382220101 is a wasteful number, since it uses less digits than its factorization.

861382220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66260170790.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 861382220101 in words is "eight hundred sixty-one billion, three hundred eighty-two million, two hundred twenty thousand, one hundred one".