1161185145 has 16 divisors (see below), whose sum is σ = 1862756352. Its totient is φ = 617678720.

The previous prime is 1161185111. The next prime is 1161185159. The reversal of 1161185145 is 5415811611.

It is not a de Polignac number, because 1161185145 - 2¹⁴ = 1161168761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95316 + ... + 106805.

It is an arithmetic number, because the mean of its divisors is an integer number (116422272).

Almost surely, 2^1161185145 is an apocalyptic number.

1161185145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161185145 is a deficient number, since it is larger than the sum of its proper divisors (701571207).

1161185145 is a wasteful number, since it uses less digits than its factorization.

1161185145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202512.

The product of its digits is 4800, while the sum is 33.

The square root of 1161185145 is about 34076.1668178802. The cubic root of 1161185145 is about 1051.0752839349.

Adding to 1161185145 its reverse (5415811611), we get a palindrome (6576996756).

The spelling of 1161185145 in words is "one billion, one hundred sixty-one million, one hundred eighty-five thousand, one hundred forty-five".