194542553 has 2 divisors, whose sum is σ = 194542554. Its totient is φ = 194542552.

The previous prime is 194542531. The next prime is 194542567. The reversal of 194542553 is 355245491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152448409 + 42094144 = 12347^2 + 6488^2 .

It is an emirp because it is prime and its reverse (355245491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194542553 - 2²⁴ = 177765337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (194542753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97271276 + 97271277.

It is an arithmetic number, because the mean of its divisors is an integer number (97271277).

Almost surely, 2^194542553 is an apocalyptic number.

It is an amenable number.

194542553 is a deficient number, since it is larger than the sum of its proper divisors (1).

194542553 is an equidigital number, since it uses as much as digits as its factorization.

194542553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

The square root of 194542553 is about 13947.8511965105. The cubic root of 194542553 is about 579.4351943229.

The spelling of 194542553 in words is "one hundred ninety-four million, five hundred forty-two thousand, five hundred fifty-three".