98991121 has 16 divisors (see below), whose sum is σ = 106920000. Its totient is φ = 91361088.

The previous prime is 98991107. The next prime is 98991143. The reversal of 98991121 is 12119989.

It is a cyclic number.

It is not a de Polignac number, because 98991121 - 2²¹ = 96893969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98991721) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198130 + ... + 198628.

It is an arithmetic number, because the mean of its divisors is an integer number (6682500).

Almost surely, 2^98991121 is an apocalyptic number.

It is an amenable number.

98991121 is a deficient number, since it is larger than the sum of its proper divisors (7928879).

98991121 is a wasteful number, since it uses less digits than its factorization.

98991121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its digits is 11664, while the sum is 40.

The square root of 98991121 is about 9949.4281745234. The cubic root of 98991121 is about 462.5926705953.

It can be divided in two parts, 98991 and 121, that multiplied together give a palindrome (11977911).

The spelling of 98991121 in words is "ninety-eight million, nine hundred ninety-one thousand, one hundred twenty-one".