99005381 has 2 divisors, whose sum is σ = 99005382. Its totient is φ = 99005380.

The previous prime is 99005353. The next prime is 99005411. The reversal of 99005381 is 18350099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96216481 + 2788900 = 9809^2 + 1670^2 .

It is an emirp because it is prime and its reverse (18350099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99005381 - 2²⁶ = 31896517 is a prime.

It is a super-2 number, since 2×99005381² = 19604130933910322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99005321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49502690 + 49502691.

It is an arithmetic number, because the mean of its divisors is an integer number (49502691).

Almost surely, 2^99005381 is an apocalyptic number.

It is an amenable number.

99005381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99005381 is an equidigital number, since it uses as much as digits as its factorization.

99005381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 99005381 is about 9950.1447728161. The cubic root of 99005381 is about 462.6148821994.

The spelling of 99005381 in words is "ninety-nine million, five thousand, three hundred eighty-one".