100195861 has 2 divisors, whose sum is σ = 100195862. Its totient is φ = 100195860.

The previous prime is 100195853. The next prime is 100195871. The reversal of 100195861 is 168591001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92044836 + 8151025 = 9594^2 + 2855^2 .

It is an emirp because it is prime and its reverse (168591001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100195861 - 2³ = 100195853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100195871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50097930 + 50097931.

It is an arithmetic number, because the mean of its divisors is an integer number (50097931).

Almost surely, 2^100195861 is an apocalyptic number.

It is an amenable number.

100195861 is a deficient number, since it is larger than the sum of its proper divisors (1).

100195861 is an equidigital number, since it uses as much as digits as its factorization.

100195861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 100195861 is about 10009.7882594988. The cubic root of 100195861 is about 464.4617211437.

The spelling of 100195861 in words is "one hundred million, one hundred ninety-five thousand, eight hundred sixty-one".