1143531457 has 4 divisors (see below), whose sum is σ = 1193250240. Its totient is φ = 1093812676.

The previous prime is 1143531443. The next prime is 1143531461. The reversal of 1143531457 is 7541353411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7541353411 = 53 ⋅142289687.

It is a cyclic number.

It is not a de Polignac number, because 1143531457 - 2⁷ = 1143531329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143531427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24859357 + ... + 24859402.

It is an arithmetic number, because the mean of its divisors is an integer number (298312560).

Almost surely, 2^1143531457 is an apocalyptic number.

It is an amenable number.

1143531457 is a deficient number, since it is larger than the sum of its proper divisors (49718783).

1143531457 is an equidigital number, since it uses as much as digits as its factorization.

1143531457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49718782.

The product of its digits is 25200, while the sum is 34.

The square root of 1143531457 is about 33816.1419591295. The cubic root of 1143531457 is about 1045.7215035205.

Adding to 1143531457 its reverse (7541353411), we get a palindrome (8684884868).

The spelling of 1143531457 in words is "one billion, one hundred forty-three million, five hundred thirty-one thousand, four hundred fifty-seven".