109637621 has 4 divisors (see below), whose sum is σ = 110723244. Its totient is φ = 108552000.

The previous prime is 109637611. The next prime is 109637639. The reversal of 109637621 is 126736901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75881521 + 33756100 = 8711^2 + 5810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109637621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109637611) 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 in 3 ways as a sum of consecutive naturals, for example, 542660 + ... + 542861.

It is an arithmetic number, because the mean of its divisors is an integer number (27680811).

Almost surely, 2^109637621 is an apocalyptic number.

It is an amenable number.

109637621 is a deficient number, since it is larger than the sum of its proper divisors (1085623).

109637621 is a wasteful number, since it uses less digits than its factorization.

109637621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085622.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 109637621 is about 10470.7984891316. The cubic root of 109637621 is about 478.6152523405.

The spelling of 109637621 in words is "one hundred nine million, six hundred thirty-seven thousand, six hundred twenty-one".