1143500551 has 4 divisors (see below), whose sum is σ = 1150784152. Its totient is φ = 1136216952.

The previous prime is 1143500549. The next prime is 1143500581. The reversal of 1143500551 is 1550053411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1550053411 = 181 ⋅8563831.

It is a cyclic number.

It is not a de Polignac number, because 1143500551 - 2¹ = 1143500549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143500521) 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, 3641565 + ... + 3641878.

It is an arithmetic number, because the mean of its divisors is an integer number (287696038).

Almost surely, 2^1143500551 is an apocalyptic number.

1143500551 is a deficient number, since it is larger than the sum of its proper divisors (7283601).

1143500551 is an equidigital number, since it uses as much as digits as its factorization.

1143500551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7283600.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1143500551 is about 33815.6849849297. The cubic root of 1143500551 is about 1045.7120825991.

Adding to 1143500551 its reverse (1550053411), we get a palindrome (2693553962).

The spelling of 1143500551 in words is "one billion, one hundred forty-three million, five hundred thousand, five hundred fifty-one".