99997213 has 4 divisors (see below), whose sum is σ = 105879420. Its totient is φ = 94115008.

The previous prime is 99997189. The next prime is 99997243. The reversal of 99997213 is 31279999.

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 64689849 + 35307364 = 8043^2 + 5942^2 .

It is a cyclic number.

It is not a de Polignac number, because 99997213 - 2¹⁷ = 99866141 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997243) 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, 2941078 + ... + 2941111.

It is an arithmetic number, because the mean of its divisors is an integer number (26469855).

Almost surely, 2^99997213 is an apocalyptic number.

It is an amenable number.

99997213 is a deficient number, since it is larger than the sum of its proper divisors (5882207).

99997213 is a wasteful number, since it uses less digits than its factorization.

99997213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882206.

The product of its digits is 275562, while the sum is 49.

The square root of 99997213 is about 9999.8606490291. The cubic root of 99997213 is about 464.1545712852.

The spelling of 99997213 in words is "ninety-nine million, nine hundred ninety-seven thousand, two hundred thirteen".