109019661 has 4 divisors (see below), whose sum is σ = 145359552. Its totient is φ = 72679772.

The previous prime is 109019639. The next prime is 109019681. The reversal of 109019661 is 166910901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 109019661 - 2¹⁴ = 109003277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109019621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18169941 + ... + 18169946.

It is an arithmetic number, because the mean of its divisors is an integer number (36339888).

Almost surely, 2^109019661 is an apocalyptic number.

It is an amenable number.

109019661 is a deficient number, since it is larger than the sum of its proper divisors (36339891).

109019661 is an equidigital number, since it uses as much as digits as its factorization.

109019661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36339890.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 109019661 is about 10441.2480575839. The cubic root of 109019661 is about 477.7143374072.

The spelling of 109019661 in words is "one hundred nine million, nineteen thousand, six hundred sixty-one".