109891321 has 2 divisors, whose sum is σ = 109891322. Its totient is φ = 109891320.

The previous prime is 109891303. The next prime is 109891339. The reversal of 109891321 is 123198901.

It is a balanced prime because it is at equal distance from previous prime (109891303) and next prime (109891339).

It can be written as a sum of positive squares in only one way, i.e., 107931321 + 1960000 = 10389^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 109891321 - 2⁵ = 109891289 is a prime.

It is a super-2 number, since 2×109891321² = 24152204862250082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109891351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54945660 + 54945661.

It is an arithmetic number, because the mean of its divisors is an integer number (54945661).

Almost surely, 2^109891321 is an apocalyptic number.

It is an amenable number.

109891321 is a deficient number, since it is larger than the sum of its proper divisors (1).

109891321 is an equidigital number, since it uses as much as digits as its factorization.

109891321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 109891321 is about 10482.9061333201. The cubic root of 109891321 is about 478.9841377354.

The spelling of 109891321 in words is "one hundred nine million, eight hundred ninety-one thousand, three hundred twenty-one".