109721597 has 2 divisors, whose sum is σ = 109721598. Its totient is φ = 109721596.

The previous prime is 109721593. The next prime is 109721609. The reversal of 109721597 is 795127901.

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., 55860676 + 53860921 = 7474^2 + 7339^2 .

It is an emirp because it is prime and its reverse (795127901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109721597 - 2² = 109721593 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109721593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54860798 + 54860799.

It is an arithmetic number, because the mean of its divisors is an integer number (54860799).

Almost surely, 2^109721597 is an apocalyptic number.

It is an amenable number.

109721597 is a deficient number, since it is larger than the sum of its proper divisors (1).

109721597 is an equidigital number, since it uses as much as digits as its factorization.

109721597 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 109721597 is about 10474.8077309323. The cubic root of 109721597 is about 478.7374182442.

The spelling of 109721597 in words is "one hundred nine million, seven hundred twenty-one thousand, five hundred ninety-seven".