99009901 has 4 divisors (see below), whose sum is σ = 99041404. Its totient is φ = 98978400.

The previous prime is 99009881. The next prime is 99009923. The reversal of 99009901 is 10990099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10990099 = 2417 ⋅4547.

It can be written as a sum of positive squares in 2 ways, for example, as 31933801 + 67076100 = 5651^2 + 8190^2 .

It is a cyclic number.

It is not a de Polignac number, because 99009901 - 2⁷ = 99009773 is a prime.

It is a deceptive number, since it divides R_99009900.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99009961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10440 + ... + 17521.

It is an arithmetic number, because the mean of its divisors is an integer number (24760351).

Almost surely, 2^99009901 is an apocalyptic number.

It is an amenable number.

99009901 is a deficient number, since it is larger than the sum of its proper divisors (31503).

99009901 is a wasteful number, since it uses less digits than its factorization.

99009901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31502.

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 99009901 is about 9950.3719025974. The cubic root of 99009901 is about 462.6219221785.

The spelling of 99009901 in words is "ninety-nine million, nine thousand, nine hundred one".