99170905391 has 8 divisors (see below), whose sum is σ = 99435497568. Its totient is φ = 98906400000.

The previous prime is 99170905387. The next prime is 99170905399. The reversal of 99170905391 is 19350907199.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99170905391 - 2² = 99170905387 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 (99170905399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2725166 + ... + 2761316.

It is an arithmetic number, because the mean of its divisors is an integer number (12429437196).

Almost surely, 2^99170905391 is an apocalyptic number.

99170905391 is a deficient number, since it is larger than the sum of its proper divisors (264592177).

99170905391 is a wasteful number, since it uses less digits than its factorization.

99170905391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43393.

The product of its (nonzero) digits is 688905, while the sum is 53.

The spelling of 99170905391 in words is "ninety-nine billion, one hundred seventy million, nine hundred five thousand, three hundred ninety-one".