861547 has 2 divisors, whose sum is σ = 861548. Its totient is φ = 861546.

The previous prime is 861541. The next prime is 861551. The reversal of 861547 is 745168.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861547 is a prime.

It is not a weakly prime, because it can be changed into another prime (861541) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430773 + 430774.

It is an arithmetic number, because the mean of its divisors is an integer number (430774).

2⁸⁶¹⁵⁴⁷ is an apocalyptic number.

861547 is a deficient number, since it is larger than the sum of its proper divisors (1).

861547 is an equidigital number, since it uses as much as digits as its factorization.

861547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 861547 is about 928.1955612908. The cubic root of 861547 is about 95.1538412273.

The spelling of 861547 in words is "eight hundred sixty-one thousand, five hundred forty-seven".