1243197049 has 4 divisors (see below), whose sum is σ = 1243921140. Its totient is φ = 1242472960.

The previous prime is 1243197023. The next prime is 1243197103. The reversal of 1243197049 is 9407913421.

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 831918649 + 411278400 = 28843^2 + 20280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243197049 - 2⁷ = 1243196921 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243197349) 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, 359464 + ... + 362905.

It is an arithmetic number, because the mean of its divisors is an integer number (310980285).

Almost surely, 2^1243197049 is an apocalyptic number.

It is an amenable number.

1243197049 is a deficient number, since it is larger than the sum of its proper divisors (724091).

1243197049 is an equidigital number, since it uses as much as digits as its factorization.

1243197049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724090.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1243197049 is about 35258.9995462151. Note that the first 3 decimals coincide. The cubic root of 1243197049 is about 1075.2595872837.

The spelling of 1243197049 in words is "one billion, two hundred forty-three million, one hundred ninety-seven thousand, forty-nine".