1209449113 has 4 divisors (see below), whose sum is σ = 1209782068. Its totient is φ = 1209116160.

The previous prime is 1209449099. The next prime is 1209449179. The reversal of 1209449113 is 3119449021.

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 32410249 + 1177038864 = 5693^2 + 34308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209449113 - 2²¹ = 1207351961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209449183) 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, 160968 + ... + 168313.

It is an arithmetic number, because the mean of its divisors is an integer number (302445517).

Almost surely, 2^1209449113 is an apocalyptic number.

It is an amenable number.

1209449113 is a deficient number, since it is larger than the sum of its proper divisors (332955).

1209449113 is an equidigital number, since it uses as much as digits as its factorization.

1209449113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332954.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1209449113 is about 34777.1349164936. The cubic root of 1209449113 is about 1065.4404969515.

The spelling of 1209449113 in words is "one billion, two hundred nine million, four hundred forty-nine thousand, one hundred thirteen".