109709561 has 12 divisors (see below), whose sum is σ = 119927952. Its totient is φ = 100307376.

The previous prime is 109709557. The next prime is 109709569. The reversal of 109709561 is 165907901.

It is not a de Polignac number, because 109709561 - 2² = 109709557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109709569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15050 + ... + 21116.

It is an arithmetic number, because the mean of its divisors is an integer number (9993996).

Almost surely, 2^109709561 is an apocalyptic number.

It is an amenable number.

109709561 is a deficient number, since it is larger than the sum of its proper divisors (10218391).

109709561 is a wasteful number, since it uses less digits than its factorization.

109709561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200 (or 6187 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 109709561 is about 10474.2331938906. The cubic root of 109709561 is about 478.7199124404.

The spelling of 109709561 in words is "one hundred nine million, seven hundred nine thousand, five hundred sixty-one".