210195901 has 2 divisors, whose sum is σ = 210195902. Its totient is φ = 210195900.

The previous prime is 210195899. The next prime is 210195913. The reversal of 210195901 is 109591012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132227001 + 77968900 = 11499^2 + 8830^2 .

It is a cyclic number.

It is not a de Polignac number, because 210195901 - 2¹ = 210195899 is a prime.

Together with 210195899, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 210195901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210195991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105097950 + 105097951.

It is an arithmetic number, because the mean of its divisors is an integer number (105097951).

Almost surely, 2^210195901 is an apocalyptic number.

It is an amenable number.

210195901 is a deficient number, since it is larger than the sum of its proper divisors (1).

210195901 is an equidigital number, since it uses as much as digits as its factorization.

210195901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 210195901 is about 14498.1343972250. The cubic root of 210195901 is about 594.5769664447.

The spelling of 210195901 in words is "two hundred ten million, one hundred ninety-five thousand, nine hundred one".