10011861 has 12 divisors (see below), whose sum is σ = 15312492. Its totient is φ = 6281856.

The previous prime is 10011857. The next prime is 10011871. The reversal of 10011861 is 16811001.

It can be written as a sum of positive squares in 2 ways, for example, as 5788836 + 4223025 = 2406^2 + 2055^2 .

It is not a de Polignac number, because 10011861 - 2² = 10011857 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011851) 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 in 11 ways as a sum of consecutive naturals, for example, 32566 + ... + 32871.

It is an arithmetic number, because the mean of its divisors is an integer number (1276041).

Almost surely, 2^10011861 is an apocalyptic number.

It is an amenable number.

10011861 is a deficient number, since it is larger than the sum of its proper divisors (5300631).

10011861 is a wasteful number, since it uses less digits than its factorization.

10011861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65460 (or 65457 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 10011861 is about 3164.1524931646. The cubic root of 10011861 is about 215.5286145146.

Adding to 10011861 its reverse (16811001), we get a palindrome (26822862).

The spelling of 10011861 in words is "ten million, eleven thousand, eight hundred sixty-one".