109607921 has 2 divisors, whose sum is σ = 109607922. Its totient is φ = 109607920.

The previous prime is 109607917. The next prime is 109607923. The reversal of 109607921 is 129706901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 48455521 = 7820^2 + 6961^2 .

It is a cyclic number.

It is not a de Polignac number, because 109607921 - 2² = 109607917 is a prime.

Together with 109607923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109607923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54803960 + 54803961.

It is an arithmetic number, because the mean of its divisors is an integer number (54803961).

Almost surely, 2^109607921 is an apocalyptic number.

It is an amenable number.

109607921 is a deficient number, since it is larger than the sum of its proper divisors (1).

109607921 is an equidigital number, since it uses as much as digits as its factorization.

109607921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 109607921 is about 10469.3801631233. The cubic root of 109607921 is about 478.5720306901.

It can be divided in two parts, 10960 and 7921, that added together give a palindrome (18881).

The spelling of 109607921 in words is "one hundred nine million, six hundred seven thousand, nine hundred twenty-one".