1243909704249 has 15 divisors (see below), whose sum is σ = 1858201096213. Its totient is φ = 829266444324.

The previous prime is 1243909704229. The next prime is 1243909704307. The reversal of 1243909704249 is 9424079093421.

The square root of 1243909704249 is 1115307.

It is a perfect power (a square), and thus also a powerful number.

1243909704249 is a `hidden beast` number, since 1 + 2 + 4 + 390 + 9 + 7 + 0 + 4 + 249 = 666.

It is not a de Polignac number, because 1243909704249 - 2⁹ = 1243909703737 is a prime.

It is a super-2 number, since 2×1243909704249² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243909704195 and 1243909704204.

It is not an unprimeable number, because it can be changed into a prime (1243909704229) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 9975802 + ... + 10099724.

Almost surely, 2^{1243909704249} is an apocalyptic number.

1243909704249 is the 1115307-th square number.

1243909704249 is the 557654-th centered octagonal number.

It is an amenable number.

1243909704249 is a deficient number, since it is larger than the sum of its proper divisors (614291391964).

1243909704249 is an frugal number, since it uses more digits than its factorization.

1243909704249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247858 (or 123926 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 1243909704249 in words is "one trillion, two hundred forty-three billion, nine hundred nine million, seven hundred four thousand, two hundred forty-nine".