861946441 has 2 divisors, whose sum is σ = 861946442. Its totient is φ = 861946440.

The previous prime is 861946417. The next prime is 861946447. The reversal of 861946441 is 144649168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 858724416 + 3222025 = 29304^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 861946441 - 2¹⁵ = 861913673 is a prime.

It is not a weakly prime, because it can be changed into another prime (861946447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430973220 + 430973221.

It is an arithmetic number, because the mean of its divisors is an integer number (430973221).

Almost surely, 2^861946441 is an apocalyptic number.

It is an amenable number.

861946441 is a deficient number, since it is larger than the sum of its proper divisors (1).

861946441 is an equidigital number, since it uses as much as digits as its factorization.

861946441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 861946441 is about 29358.9243842481. The cubic root of 861946441 is about 951.6854441936.

The spelling of 861946441 in words is "eight hundred sixty-one million, nine hundred forty-six thousand, four hundred forty-one".