1161165505 has 4 divisors (see below), whose sum is σ = 1393398612. Its totient is φ = 928932400.

The previous prime is 1161165497. The next prime is 1161165527. The reversal of 1161165505 is 5055611611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5055611611 = 36571 ⋅138241.

It can be written as a sum of positive squares in 2 ways, for example, as 224070961 + 937094544 = 14969^2 + 30612^2 .

It is not a de Polignac number, because 1161165505 - 2³ = 1161165497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116116546 + ... + 116116555.

It is an arithmetic number, because the mean of its divisors is an integer number (348349653).

Almost surely, 2^1161165505 is an apocalyptic number.

It is an amenable number.

1161165505 is a deficient number, since it is larger than the sum of its proper divisors (232233107).

1161165505 is an equidigital number, since it uses as much as digits as its factorization.

1161165505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232233106.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1161165505 is about 34075.8786387086. The cubic root of 1161165505 is about 1051.0693580252.

The spelling of 1161165505 in words is "one billion, one hundred sixty-one million, one hundred sixty-five thousand, five hundred five".