99673813 has 2 divisors, whose sum is σ = 99673814. Its totient is φ = 99673812.

The previous prime is 99673807. The next prime is 99673831. The reversal of 99673813 is 31837699.

Together with next prime (99673831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99640324 + 33489 = 9982^2 + 183^2 .

It is an emirp because it is prime and its reverse (31837699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99673813 - 2⁵ = 99673781 is a prime.

It is a super-3 number, since 3×99673813³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99673843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49836906 + 49836907.

It is an arithmetic number, because the mean of its divisors is an integer number (49836907).

Almost surely, 2^99673813 is an apocalyptic number.

99673813 is the 5337-th centered heptagonal number.

It is an amenable number.

99673813 is a deficient number, since it is larger than the sum of its proper divisors (1).

99673813 is an equidigital number, since it uses as much as digits as its factorization.

99673813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 99673813 is about 9983.6773285198. The cubic root of 99673813 is about 463.6536583240.

The spelling of 99673813 in words is "ninety-nine million, six hundred seventy-three thousand, eight hundred thirteen".