195054919 has 2 divisors, whose sum is σ = 195054920. Its totient is φ = 195054918.

The previous prime is 195054913. The next prime is 195054943. The reversal of 195054919 is 919450591.

It is a weak prime.

It is an emirp because it is prime and its reverse (919450591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195054919 - 2⁵ = 195054887 is a prime.

It is a super-2 number, since 2×195054919² = 76092842852193122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195054913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97527459 + 97527460.

It is an arithmetic number, because the mean of its divisors is an integer number (97527460).

Almost surely, 2^195054919 is an apocalyptic number.

195054919 is a deficient number, since it is larger than the sum of its proper divisors (1).

195054919 is an equidigital number, since it uses as much as digits as its factorization.

195054919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 195054919 is about 13966.2063209735. The cubic root of 195054919 is about 579.9434338413.

The spelling of 195054919 in words is "one hundred ninety-five million, fifty-four thousand, nine hundred nineteen".