99901 has 2 divisors, whose sum is σ = 99902. Its totient is φ = 99900.

The previous prime is 99881. The next prime is 99907. The reversal of 99901 is 10999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 676 = 315^2 + 26^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99901 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49950 + 49951.

It is an arithmetic number, because the mean of its divisors is an integer number (49951).

2⁹⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

99901 is a deficient number, since it is larger than the sum of its proper divisors (1).

99901 is an equidigital number, since it uses as much as digits as its factorization.

99901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 99901 is about 316.0711945116. The cubic root of 99901 is about 46.4005660355.

It can be divided in two parts, 99 and 901, that added together give a cube (1000 = 10³).

The spelling of 99901 in words is "ninety-nine thousand, nine hundred one".