109779521 has 2 divisors, whose sum is σ = 109779522. Its totient is φ = 109779520.

The previous prime is 109779499. The next prime is 109779547. The reversal of 109779521 is 125977901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 15689521 = 9700^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 109779521 - 2¹⁰ = 109778497 is a prime.

It is not a weakly prime, because it can be changed into another prime (109779121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54889760 + 54889761.

It is an arithmetic number, because the mean of its divisors is an integer number (54889761).

Almost surely, 2^109779521 is an apocalyptic number.

It is an amenable number.

109779521 is a deficient number, since it is larger than the sum of its proper divisors (1).

109779521 is an equidigital number, since it uses as much as digits as its factorization.

109779521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 109779521 is about 10477.5722856013. The cubic root of 109779521 is about 478.8216481152.

The spelling of 109779521 in words is "one hundred nine million, seven hundred seventy-nine thousand, five hundred twenty-one".