194990897 has 4 divisors (see below), whose sum is σ = 195143460. Its totient is φ = 194838336.

The previous prime is 194990893. The next prime is 194990909. The reversal of 194990897 is 798099491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178596496 + 16394401 = 13364^2 + 4049^2 .

It is a cyclic number.

It is not a de Polignac number, because 194990897 - 2² = 194990893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194990891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74348 + ... + 76925.

It is an arithmetic number, because the mean of its divisors is an integer number (48785865).

Almost surely, 2^194990897 is an apocalyptic number.

It is an amenable number.

194990897 is a deficient number, since it is larger than the sum of its proper divisors (152563).

194990897 is a wasteful number, since it uses less digits than its factorization.

194990897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152562.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 194990897 is about 13963.9141002801. The cubic root of 194990897 is about 579.8799761551.

The spelling of 194990897 in words is "one hundred ninety-four million, nine hundred ninety thousand, eight hundred ninety-seven".