109288661 has 2 divisors, whose sum is σ = 109288662. Its totient is φ = 109288660.

The previous prime is 109288649. The next prime is 109288687. The reversal of 109288661 is 166882901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87142225 + 22146436 = 9335^2 + 4706^2 .

It is an emirp because it is prime and its reverse (166882901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109288661 - 2¹⁰ = 109287637 is a prime.

It is a super-2 number, since 2×109288661² = 23888022846345842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109288261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54644330 + 54644331.

It is an arithmetic number, because the mean of its divisors is an integer number (54644331).

Almost surely, 2^109288661 is an apocalyptic number.

It is an amenable number.

109288661 is a deficient number, since it is larger than the sum of its proper divisors (1).

109288661 is an equidigital number, since it uses as much as digits as its factorization.

109288661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 109288661 is about 10454.1217230335. The cubic root of 109288661 is about 478.1069259461.

The spelling of 109288661 in words is "one hundred nine million, two hundred eighty-eight thousand, six hundred sixty-one".