195094021 has 2 divisors, whose sum is σ = 195094022. Its totient is φ = 195094020.

The previous prime is 195094001. The next prime is 195094087. The reversal of 195094021 is 120490591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140541025 + 54552996 = 11855^2 + 7386^2 .

It is a cyclic number.

It is not a de Polignac number, because 195094021 - 2⁷ = 195093893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195094001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97547010 + 97547011.

It is an arithmetic number, because the mean of its divisors is an integer number (97547011).

Almost surely, 2^195094021 is an apocalyptic number.

It is an amenable number.

195094021 is a deficient number, since it is larger than the sum of its proper divisors (1).

195094021 is an equidigital number, since it uses as much as digits as its factorization.

195094021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 195094021 is about 13967.6061298993. The cubic root of 195094021 is about 579.9821843517.

The spelling of 195094021 in words is "one hundred ninety-five million, ninety-four thousand, twenty-one".