99619901 has 4 divisors (see below), whose sum is σ = 103055100. Its totient is φ = 96184704.

The previous prime is 99619879. The next prime is 99619909. The reversal of 99619901 is 10991699.

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 27352900 + 72267001 = 5230^2 + 8501^2 .

It is a cyclic number.

It is not a de Polignac number, because 99619901 - 2¹⁸ = 99357757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99619909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1717556 + ... + 1717613.

It is an arithmetic number, because the mean of its divisors is an integer number (25763775).

Almost surely, 2^99619901 is an apocalyptic number.

It is an amenable number.

99619901 is a deficient number, since it is larger than the sum of its proper divisors (3435199).

99619901 is a wasteful number, since it uses less digits than its factorization.

99619901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435198.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 99619901 is about 9980.9769561902. The cubic root of 99619901 is about 463.5700489206.

The spelling of 99619901 in words is "ninety-nine million, six hundred nineteen thousand, nine hundred one".