861943441 has 2 divisors, whose sum is σ = 861943442. Its totient is φ = 861943440.

The previous prime is 861943427. The next prime is 861943507. The reversal of 861943441 is 144349168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 767290000 + 94653441 = 27700^2 + 9729^2 .

It is a cyclic number.

It is not a de Polignac number, because 861943441 - 2²³ = 853554833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 861943394 and 861943403.

It is not a weakly prime, because it can be changed into another prime (861943241) 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 as a sum of consecutive naturals, namely, 430971720 + 430971721.

It is an arithmetic number, because the mean of its divisors is an integer number (430971721).

Almost surely, 2^861943441 is an apocalyptic number.

It is an amenable number.

861943441 is a deficient number, since it is larger than the sum of its proper divisors (1).

861943441 is an equidigital number, since it uses as much as digits as its factorization.

861943441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 861943441 is about 29358.8732924137. The cubic root of 861943441 is about 951.6843400802.

The spelling of 861943441 in words is "eight hundred sixty-one million, nine hundred forty-three thousand, four hundred forty-one".