99109121 has 2 divisors, whose sum is σ = 99109122. Its totient is φ = 99109120.

The previous prime is 99109103. The next prime is 99109123. The reversal of 99109121 is 12190199.

99109121 = 7039² + 7040².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 49547521 = 7040^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 99109121 - 2¹⁴ = 99092737 is a prime.

Together with 99109123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99109123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49554560 + 49554561.

It is an arithmetic number, because the mean of its divisors is an integer number (49554561).

Almost surely, 2^99109121 is an apocalyptic number.

99109121 is the 7040-th centered square number.

It is an amenable number.

99109121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99109121 is an equidigital number, since it uses as much as digits as its factorization.

99109121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 99109121 is about 9955.3563974375. The cubic root of 99109121 is about 462.7764051217.

The spelling of 99109121 in words is "ninety-nine million, one hundred nine thousand, one hundred twenty-one".