194400034991 has 4 divisors (see below), whose sum is σ = 204631615800. Its totient is φ = 184168454184.

The previous prime is 194400034987. The next prime is 194400034993. The reversal of 194400034991 is 199430004491.

It is a happy number.

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

It is not a de Polignac number, because 194400034991 - 2² = 194400034987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194400034993) 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 in 3 ways as a sum of consecutive naturals, for example, 5115790376 + ... + 5115790413.

It is an arithmetic number, because the mean of its divisors is an integer number (51157903950).

Almost surely, 2^194400034991 is an apocalyptic number.

194400034991 is a deficient number, since it is larger than the sum of its proper divisors (10231580809).

194400034991 is a wasteful number, since it uses less digits than its factorization.

194400034991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10231580808.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 194400034991 in words is "one hundred ninety-four billion, four hundred million, thirty-four thousand, nine hundred ninety-one".