8137861 has 2 divisors, whose sum is σ = 8137862. Its totient is φ = 8137860.

The previous prime is 8137853. The next prime is 8137867. The reversal of 8137861 is 1687318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 820836 = 2705^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 8137861 - 2³ = 8137853 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8137867) 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, 4068930 + 4068931.

It is an arithmetic number, because the mean of its divisors is an integer number (4068931).

Almost surely, 2^8137861 is an apocalyptic number.

It is an amenable number.

8137861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8137861 is an equidigital number, since it uses as much as digits as its factorization.

8137861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 8137861 is about 2852.6936393521. The cubic root of 8137861 is about 201.1423049425.

It can be divided in two parts, 8137 and 861, that added together give a palindrome (8998).

The spelling of 8137861 in words is "eight million, one hundred thirty-seven thousand, eight hundred sixty-one".