194487697 has 2 divisors, whose sum is σ = 194487698. Its totient is φ = 194487696.

The previous prime is 194487677. The next prime is 194487731. The reversal of 194487697 is 796784491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117592336 + 76895361 = 10844^2 + 8769^2 .

It is an emirp because it is prime and its reverse (796784491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194487697 - 2⁷ = 194487569 is a prime.

It is not a weakly prime, because it can be changed into another prime (194487607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97243848 + 97243849.

It is an arithmetic number, because the mean of its divisors is an integer number (97243849).

Almost surely, 2^194487697 is an apocalyptic number.

It is an amenable number.

194487697 is a deficient number, since it is larger than the sum of its proper divisors (1).

194487697 is an equidigital number, since it uses as much as digits as its factorization.

194487697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 194487697 is about 13945.8845900861. The cubic root of 194487697 is about 579.3807272589.

The spelling of 194487697 in words is "one hundred ninety-four million, four hundred eighty-seven thousand, six hundred ninety-seven".