99201601 has 4 divisors (see below), whose sum is σ = 99232132. Its totient is φ = 99171072.

The previous prime is 99201593. The next prime is 99201689. The reversal of 99201601 is 10610299.

It is a Cunningham number, because it is equal to 9960²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10610299 = 7 ⋅1515757.

It can be written as a sum of positive squares in 2 ways, for example, as 8856576 + 90345025 = 2976^2 + 9505^2 .

It is a cyclic number.

It is not a de Polignac number, because 99201601 - 2³ = 99201593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99201601.

It is not an unprimeable number, because it can be changed into a prime (99201701) 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, 9720 + ... + 17113.

It is an arithmetic number, because the mean of its divisors is an integer number (24808033).

Almost surely, 2^99201601 is an apocalyptic number.

It is an amenable number.

99201601 is a deficient number, since it is larger than the sum of its proper divisors (30531).

99201601 is a wasteful number, since it uses less digits than its factorization.

99201601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 99201601 is about 9960.0000502008. Note that the first 4 decimals coincide. The cubic root of 99201601 is about 462.9203012527.

The spelling of 99201601 in words is "ninety-nine million, two hundred one thousand, six hundred one".