109288261 has 2 divisors, whose sum is σ = 109288262. Its totient is φ = 109288260.

The previous prime is 109288243. The next prime is 109288297. The reversal of 109288261 is 162882901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 40564161 = 8290^2 + 6369^2 .

It is an emirp because it is prime and its reverse (162882901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109288261 - 2¹⁹ = 108763973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109288261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109288561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54644130 + 54644131.

It is an arithmetic number, because the mean of its divisors is an integer number (54644131).

Almost surely, 2^109288261 is an apocalyptic number.

It is an amenable number.

109288261 is a deficient number, since it is larger than the sum of its proper divisors (1).

109288261 is an equidigital number, since it uses as much as digits as its factorization.

109288261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 109288261 is about 10454.1025918058. The cubic root of 109288261 is about 478.1063426499.

The spelling of 109288261 in words is "one hundred nine million, two hundred eighty-eight thousand, two hundred sixty-one".