194951893 has 2 divisors, whose sum is σ = 194951894. Its totient is φ = 194951892.

The previous prime is 194951873. The next prime is 194951909. The reversal of 194951893 is 398159491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194407249 + 544644 = 13943^2 + 738^2 .

It is an emirp because it is prime and its reverse (398159491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194951893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194951803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97475946 + 97475947.

It is an arithmetic number, because the mean of its divisors is an integer number (97475947).

Almost surely, 2^194951893 is an apocalyptic number.

It is an amenable number.

194951893 is a deficient number, since it is larger than the sum of its proper divisors (1).

194951893 is an equidigital number, since it uses as much as digits as its factorization.

194951893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 194951893 is about 13962.5174306068. The cubic root of 194951893 is about 579.8413091418.

The spelling of 194951893 in words is "one hundred ninety-four million, nine hundred fifty-one thousand, eight hundred ninety-three".