99831213 has 6 divisors (see below), whose sum is σ = 144200654. Its totient is φ = 66554136.

The previous prime is 99831209. The next prime is 99831227. The reversal of 99831213 is 31213899.

It can be written as a sum of positive squares in only one way, i.e., 90668484 + 9162729 = 9522^2 + 3027^2 .

It is not a de Polignac number, because 99831213 - 2² = 99831209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99831203) 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 5 ways as a sum of consecutive naturals, for example, 5546170 + ... + 5546187.

Almost surely, 2^99831213 is an apocalyptic number.

It is an amenable number.

99831213 is a deficient number, since it is larger than the sum of its proper divisors (44369441).

99831213 is a wasteful number, since it uses less digits than its factorization.

99831213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11092363 (or 11092360 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 99831213 is about 9991.5570858600. The cubic root of 99831213 is about 463.8975896780.

The spelling of 99831213 in words is "ninety-nine million, eight hundred thirty-one thousand, two hundred thirteen".