99999197 has 4 divisors (see below), whose sum is σ = 102701916. Its totient is φ = 97296480.

The previous prime is 99999187. The next prime is 99999217. The reversal of 99999197 is 79199999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79199999 = 19 ⋅4168421.

It can be written as a sum of positive squares in 2 ways, for example, as 62188996 + 37810201 = 7886^2 + 6149^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999197 - 2¹⁶ = 99933661 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 (99999157) 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, 1351304 + ... + 1351377.

It is an arithmetic number, because the mean of its divisors is an integer number (25675479).

Almost surely, 2^99999197 is an apocalyptic number.

It is an amenable number.

99999197 is a deficient number, since it is larger than the sum of its proper divisors (2702719).

99999197 is a wasteful number, since it uses less digits than its factorization.

99999197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702718.

The product of its digits is 3720087, while the sum is 62.

The square root of 99999197 is about 9999.9598499194. The cubic root of 99999197 is about 464.1576409593.

The spelling of 99999197 in words is "ninety-nine million, nine hundred ninety-nine thousand, one hundred ninety-seven".