10189009861 has 2 divisors, whose sum is σ = 10189009862. Its totient is φ = 10189009860.

The previous prime is 10189009841. The next prime is 10189009871. The reversal of 10189009861 is 16890098101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7939879236 + 2249130625 = 89106^2 + 47425^2 .

It is an emirp because it is prime and its reverse (16890098101) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 19860068101 and 10186006891.

It is a cyclic number.

It is not a de Polignac number, because 10189009861 - 2⁵ = 10189009829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10189009801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5094504930 + 5094504931.

It is an arithmetic number, because the mean of its divisors is an integer number (5094504931).

Almost surely, 2^10189009861 is an apocalyptic number.

It is an amenable number.

10189009861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10189009861 is an equidigital number, since it uses as much as digits as its factorization.

10189009861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 43.

The spelling of 10189009861 in words is "ten billion, one hundred eighty-nine million, nine thousand, eight hundred sixty-one".