1209448452869 has 4 divisors (see below), whose sum is σ = 1209480865644. Its totient is φ = 1209416040096.

The previous prime is 1209448452841. The next prime is 1209448452937. The reversal of 1209448452869 is 9682548449021.

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 183816272644 + 1025632180225 = 428738^2 + 1012735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209448452869 - 2¹⁶ = 1209448387333 is a prime.

It is a super-2 number, since 2×1209448452869² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209448457869) 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, 16150352 + ... + 16225065.

It is an arithmetic number, because the mean of its divisors is an integer number (302370216411).

Almost surely, 2^{1209448452869} is an apocalyptic number.

It is an amenable number.

1209448452869 is a deficient number, since it is larger than the sum of its proper divisors (32412775).

1209448452869 is an equidigital number, since it uses as much as digits as its factorization.

1209448452869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32412774.

The product of its (nonzero) digits is 39813120, while the sum is 62.

The spelling of 1209448452869 in words is "one trillion, two hundred nine billion, four hundred forty-eight million, four hundred fifty-two thousand, eight hundred sixty-nine".