1543797449 has 2 divisors, whose sum is σ = 1543797450. Its totient is φ = 1543797448.

The previous prime is 1543797439. The next prime is 1543797473. The reversal of 1543797449 is 9447973451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1529357449 + 14440000 = 39107^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543797449 - 2⁴ = 1543797433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1543797449.

It is not a weakly prime, because it can be changed into another prime (1543797439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771898724 + 771898725.

It is an arithmetic number, because the mean of its divisors is an integer number (771898725).

Almost surely, 2^1543797449 is an apocalyptic number.

It is an amenable number.

1543797449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543797449 is an equidigital number, since it uses as much as digits as its factorization.

1543797449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 53.

The square root of 1543797449 is about 39291.1879306289. The cubic root of 1543797449 is about 1155.7487693032.

The spelling of 1543797449 in words is "one billion, five hundred forty-three million, seven hundred ninety-seven thousand, four hundred forty-nine".