861770401 has 2 divisors, whose sum is σ = 861770402. Its totient is φ = 861770400.

The previous prime is 861770389. The next prime is 861770411. The reversal of 861770401 is 104077168.

861770401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453690000 + 408080401 = 21300^2 + 20201^2 .

It is a cyclic number.

It is not a de Polignac number, because 861770401 - 2²¹ = 859673249 is a prime.

It is equal to p_44153827 and since 861770401 and 44153827 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (861770411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430885200 + 430885201.

It is an arithmetic number, because the mean of its divisors is an integer number (430885201).

Almost surely, 2^861770401 is an apocalyptic number.

It is an amenable number.

861770401 is a deficient number, since it is larger than the sum of its proper divisors (1).

861770401 is an equidigital number, since it uses as much as digits as its factorization.

861770401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 861770401 is about 29355.9261649160. The cubic root of 861770401 is about 951.6206504877.

The spelling of 861770401 in words is "eight hundred sixty-one million, seven hundred seventy thousand, four hundred one".