994208635897 has 4 divisors (see below), whose sum is σ = 994210671220. Its totient is φ = 994206600576.

The previous prime is 994208635883. The next prime is 994208635943. The reversal of 994208635897 is 798536802499.

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 595730810896 + 398477825001 = 771836^2 + 631251^2 .

It is a 3-Lehmer number, since φ(994208635897) divides (994208635897-1)³.

It is a cyclic number.

It is not a de Polignac number, because 994208635897 - 2¹¹ = 994208633849 is a prime.

It is a deceptive number, since it divides R_994208635896.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994208635807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203533 + ... + 1424725.

It is an arithmetic number, because the mean of its divisors is an integer number (248552667805).

Almost surely, 2^994208635897 is an apocalyptic number.

994208635897 is the 814129-th pentagonal number.

It is an amenable number.

994208635897 is a deficient number, since it is larger than the sum of its proper divisors (2035323).

994208635897 is a wasteful number, since it uses less digits than its factorization.

994208635897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035322.

The product of its (nonzero) digits is 235146240, while the sum is 70.

The spelling of 994208635897 in words is "nine hundred ninety-four billion, two hundred eight million, six hundred thirty-five thousand, eight hundred ninety-seven".