8501861 has 2 divisors, whose sum is σ = 8501862. Its totient is φ = 8501860.

The previous prime is 8501849. The next prime is 8501869. The reversal of 8501861 is 1681058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5909761 + 2592100 = 2431^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501861 - 2¹⁸ = 8239717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8501869) 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, 4250930 + 4250931.

It is an arithmetic number, because the mean of its divisors is an integer number (4250931).

Almost surely, 2^8501861 is an apocalyptic number.

It is an amenable number.

8501861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8501861 is an equidigital number, since it uses as much as digits as its factorization.

8501861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 8501861 is about 2915.7950888223. The cubic root of 8501861 is about 204.0976480485.

The spelling of 8501861 in words is "eight million, five hundred one thousand, eight hundred sixty-one".