1543320451 has 4 divisors (see below), whose sum is σ = 1543568400. Its totient is φ = 1543072504.

The previous prime is 1543320433. The next prime is 1543320479. The reversal of 1543320451 is 1540233451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1543320451 - 2¹⁷ = 1543189379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1543320491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114391 + ... + 127168.

It is an arithmetic number, because the mean of its divisors is an integer number (385892100).

Almost surely, 2^1543320451 is an apocalyptic number.

1543320451 is a deficient number, since it is larger than the sum of its proper divisors (247949).

1543320451 is an equidigital number, since it uses as much as digits as its factorization.

1543320451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247948.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1543320451 is about 39285.1174237777. The cubic root of 1543320451 is about 1155.6297237552.

The spelling of 1543320451 in words is "one billion, five hundred forty-three million, three hundred twenty thousand, four hundred fifty-one".