1109209901 has 4 divisors (see below), whose sum is σ = 1111857600. Its totient is φ = 1106562204.

The previous prime is 1109209889. The next prime is 1109209903. The reversal of 1109209901 is 1099029011.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1099029011 = 2017 ⋅544883.

It is a cyclic number.

It is not a de Polignac number, because 1109209901 - 2¹⁴ = 1109193517 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 (1109209903) 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, 1323221 + ... + 1324058.

It is an arithmetic number, because the mean of its divisors is an integer number (277964400).

Almost surely, 2^1109209901 is an apocalyptic number.

It is an amenable number.

1109209901 is a deficient number, since it is larger than the sum of its proper divisors (2647699).

1109209901 is an equidigital number, since it uses as much as digits as its factorization.

1109209901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647698.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1109209901 is about 33304.8029719439. The cubic root of 1109209901 is about 1035.1530812028.

The spelling of 1109209901 in words is "one billion, one hundred nine million, two hundred nine thousand, nine hundred one".