861980941 has 4 divisors (see below), whose sum is σ = 870349792. Its totient is φ = 853612092.

The previous prime is 861980921. The next prime is 861981013. The reversal of 861980941 is 149089168.

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 861980941 - 2⁵ = 861980909 is a prime.

It is a super-2 number, since 2×861980941² = 1486022285294490962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861980891 and 861980900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861980921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4184271 + ... + 4184476.

It is an arithmetic number, because the mean of its divisors is an integer number (217587448).

Almost surely, 2^861980941 is an apocalyptic number.

It is an amenable number.

861980941 is a deficient number, since it is larger than the sum of its proper divisors (8368851).

861980941 is a wasteful number, since it uses less digits than its factorization.

861980941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8368850.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 861980941 is about 29359.5119339542. The cubic root of 861980941 is about 951.6981413126.

The spelling of 861980941 in words is "eight hundred sixty-one million, nine hundred eighty thousand, nine hundred forty-one".