861772122 has 40 divisors (see below), whose sum is σ = 1934608500. Its totient is φ = 286721856.

The previous prime is 861772063. The next prime is 861772123. The reversal of 861772122 is 221277168.

It can be written as a sum of positive squares in 2 ways, for example, as 861363801 + 408321 = 29349^2 + 639^2 .

It is not an unprimeable number, because it can be changed into a prime (861772123) 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 19 ways as a sum of consecutive naturals, for example, 87504 + ... + 96852.

Almost surely, 2^861772122 is an apocalyptic number.

861772122 is an abundant number, since it is smaller than the sum of its proper divisors (1072836378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861772122 is a wasteful number, since it uses less digits than its factorization.

861772122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932 (or 9923 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 861772122 is about 29355.9554775517. The cubic root of 861772122 is about 951.6212839658.

The spelling of 861772122 in words is "eight hundred sixty-one million, seven hundred seventy-two thousand, one hundred twenty-two".