99601921 has 8 divisors (see below), whose sum is σ = 103375080. Its totient is φ = 95851392.

The previous prime is 99601907. The next prime is 99601951. The reversal of 99601921 is 12910699.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 98903025 = 836^2 + 9945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99601921 - 2⁹ = 99601409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99601951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3591 + ... + 14563.

It is an arithmetic number, because the mean of its divisors is an integer number (12921885).

Almost surely, 2^99601921 is an apocalyptic number.

It is an amenable number.

99601921 is a deficient number, since it is larger than the sum of its proper divisors (3773159).

99601921 is a wasteful number, since it uses less digits than its factorization.

99601921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11315.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 99601921 is about 9980.0762021139. The cubic root of 99601921 is about 463.5421579373.

It can be divided in two parts, 9960 and 1921, that added together give a square (11881 = 109²).

The spelling of 99601921 in words is "ninety-nine million, six hundred one thousand, nine hundred twenty-one".