99605381 has 2 divisors, whose sum is σ = 99605382. Its totient is φ = 99605380.

The previous prime is 99605371. The next prime is 99605383. The reversal of 99605381 is 18350699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55502500 + 44102881 = 7450^2 + 6641^2 .

It is an emirp because it is prime and its reverse (18350699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99605381 - 2¹⁴ = 99588997 is a prime.

It is a super-2 number, since 2×99605381² = 19842463848310322, which contains 22 as substring.

Together with 99605383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99605383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49802690 + 49802691.

It is an arithmetic number, because the mean of its divisors is an integer number (49802691).

Almost surely, 2^99605381 is an apocalyptic number.

It is an amenable number.

99605381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99605381 is an equidigital number, since it uses as much as digits as its factorization.

99605381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 99605381 is about 9980.2495459783. The cubic root of 99605381 is about 463.5475254285.

The spelling of 99605381 in words is "ninety-nine million, six hundred five thousand, three hundred eighty-one".