99890641 has 4 divisors (see below), whose sum is σ = 99919984.
Its totient is φ = 99861300.
The previous prime is 99890627. The next prime is 99890647. The reversal of 99890641 is 14609899.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 99890641 - 215 = 99857873 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 99890591 and 99890600.
It is not an unprimeable number, because it can be changed into a prime (99890647) 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, 8775 + ... + 16636.
It is an arithmetic number, because the mean of its divisors is an integer number (24979996).
Almost surely, 299890641 is an apocalyptic number.
99890641 is the 8161-st centered triangular number.
It is an amenable number.
99890641 is a deficient number, since it is larger than the sum of its proper divisors (29343).
99890641 is a wasteful number, since it uses less digits than its factorization.
99890641 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 29342.
The product of its (nonzero) digits is 139968, while the sum is 46.
The square root of 99890641 is about 9994.5305542582.
The cubic root of 99890641 is about 463.9896218076.
The spelling of 99890641 in words is "ninety-nine million, eight hundred ninety thousand, six hundred forty-one".