99990101 has 4 divisors (see below), whose sum is σ = 100980204. Its totient is φ = 99000000.

The previous prime is 99990091. The next prime is 99990113. The reversal of 99990101 is 10109999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50779876 + 49210225 = 7126^2 + 7015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99990101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494900 + ... + 495101.

It is an arithmetic number, because the mean of its divisors is an integer number (25245051).

Almost surely, 2^99990101 is an apocalyptic number.

It is an amenable number.

99990101 is a deficient number, since it is larger than the sum of its proper divisors (990103).

99990101 is a wasteful number, since it uses less digits than its factorization.

99990101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990102.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 99990101 is about 9999.5050377506. The cubic root of 99990101 is about 464.1435671599.

The spelling of 99990101 in words is "ninety-nine million, nine hundred ninety thousand, one hundred one".