99905161 has 2 divisors, whose sum is σ = 99905162. Its totient is φ = 99905160.

The previous prime is 99905153. The next prime is 99905171. The reversal of 99905161 is 16150999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99121936 + 783225 = 9956^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 99905161 - 2³ = 99905153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99905101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952580 + 49952581.

It is an arithmetic number, because the mean of its divisors is an integer number (49952581).

Almost surely, 2^99905161 is an apocalyptic number.

It is an amenable number.

99905161 is a deficient number, since it is larger than the sum of its proper divisors (1).

99905161 is an equidigital number, since it uses as much as digits as its factorization.

99905161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 99905161 is about 9995.2569251621. The cubic root of 99905161 is about 464.0121024018.

It can be divided in two parts, 9990 and 5161, that added together give a palindrome (15151).

The spelling of 99905161 in words is "ninety-nine million, nine hundred five thousand, one hundred sixty-one".