10109861 has 2 divisors, whose sum is σ = 10109862. Its totient is φ = 10109860.

The previous prime is 10109851. The next prime is 10109863. The reversal of 10109861 is 16890101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 3632836 = 2545^2 + 1906^2 .

It is an emirp because it is prime and its reverse (16890101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10109861 - 2¹⁴ = 10093477 is a prime.

Together with 10109863, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₆₇₁₄₂₆ and since 10109861 and 671426 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10109861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10109863) 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, 5054930 + 5054931.

It is an arithmetic number, because the mean of its divisors is an integer number (5054931).

Almost surely, 2^10109861 is an apocalyptic number.

It is an amenable number.

10109861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10109861 is an equidigital number, since it uses as much as digits as its factorization.

10109861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 10109861 is about 3179.6007611019. The cubic root of 10109861 is about 216.2295584718.

Adding to 10109861 its reverse (16890101), we get a palindrome (26999962).

The spelling of 10109861 in words is "ten million, one hundred nine thousand, eight hundred sixty-one".