109389521 has 2 divisors, whose sum is σ = 109389522. Its totient is φ = 109389520.

The previous prime is 109389503. The next prime is 109389557. The reversal of 109389521 is 125983901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90345025 + 19044496 = 9505^2 + 4364^2 .

It is a cyclic number.

It is not a de Polignac number, because 109389521 - 2¹⁰ = 109388497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109389571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54694760 + 54694761.

It is an arithmetic number, because the mean of its divisors is an integer number (54694761).

Almost surely, 2^109389521 is an apocalyptic number.

It is an amenable number.

109389521 is a deficient number, since it is larger than the sum of its proper divisors (1).

109389521 is an equidigital number, since it uses as much as digits as its factorization.

109389521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 109389521 is about 10458.9445452206. The cubic root of 109389521 is about 478.2539586984.

The spelling of 109389521 in words is "one hundred nine million, three hundred eighty-nine thousand, five hundred twenty-one".