1145543161 has 4 divisors (see below), whose sum is σ = 1309192192. Its totient is φ = 981894132.

The previous prime is 1145543159. The next prime is 1145543183. The reversal of 1145543161 is 1613455411.

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.

It is a cyclic number.

It is not a de Polignac number, because 1145543161 - 2¹ = 1145543159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1145543101) 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, 81824505 + ... + 81824518.

It is an arithmetic number, because the mean of its divisors is an integer number (327298048).

Almost surely, 2^1145543161 is an apocalyptic number.

It is an amenable number.

1145543161 is a deficient number, since it is larger than the sum of its proper divisors (163649031).

1145543161 is an equidigital number, since it uses as much as digits as its factorization.

1145543161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163649030.

The product of its digits is 7200, while the sum is 31.

The square root of 1145543161 is about 33845.8736185078. The cubic root of 1145543161 is about 1046.3343564279.

Adding to 1145543161 its reverse (1613455411), we get a palindrome (2758998572).

The spelling of 1145543161 in words is "one billion, one hundred forty-five million, five hundred forty-three thousand, one hundred sixty-one".