861541 has 2 divisors, whose sum is σ = 861542. Its totient is φ = 861540.

The previous prime is 861499. The next prime is 861547. The reversal of 861541 is 145168.

861541 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., 801025 + 60516 = 895^2 + 246^2 .

It is a cyclic number.

It is not a de Polignac number, because 861541 - 2¹¹ = 859493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861547) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430770 + 430771.

It is an arithmetic number, because the mean of its divisors is an integer number (430771).

2⁸⁶¹⁵⁴¹ is an apocalyptic number.

It is an amenable number.

861541 is a deficient number, since it is larger than the sum of its proper divisors (1).

861541 is an equidigital number, since it uses as much as digits as its factorization.

861541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 861541 is about 928.1923292077. The cubic root of 861541 is about 95.1536203361.

The spelling of 861541 in words is "eight hundred sixty-one thousand, five hundred forty-one".