99430813 has 2 divisors, whose sum is σ = 99430814. Its totient is φ = 99430812.

The previous prime is 99430811. The next prime is 99430873. The reversal of 99430813 is 31803499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97653924 + 1776889 = 9882^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 99430813 - 2¹ = 99430811 is a prime.

It is a super-3 number, since 3×99430813³ (a number of 25 digits) contains 333 as substring.

Together with 99430811, it forms a pair of twin primes.

It is the 9972-nd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99430811) by changing a digit.

It is a nontrivial repunit in base 9971.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49715406 + 49715407.

It is an arithmetic number, because the mean of its divisors is an integer number (49715407).

Almost surely, 2^99430813 is an apocalyptic number.

It is an amenable number.

99430813 is a deficient number, since it is larger than the sum of its proper divisors (1).

99430813 is an equidigital number, since it uses as much as digits as its factorization.

99430813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 99430813 is about 9971.5000376072. The cubic root of 99430813 is about 463.2765632128.

The spelling of 99430813 in words is "ninety-nine million, four hundred thirty thousand, eight hundred thirteen".