1161500505 has 32 divisors (see below), whose sum is σ = 2047448448. Its totient is φ = 557568000.

The previous prime is 1161500497. The next prime is 1161500507. The reversal of 1161500505 is 5050051611.

It is not a de Polignac number, because 1161500505 - 2³ = 1161500497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161500507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18184 + ... + 51513.

It is an arithmetic number, because the mean of its divisors is an integer number (63982764).

Almost surely, 2^1161500505 is an apocalyptic number.

1161500505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161500505 is a deficient number, since it is larger than the sum of its proper divisors (885947943).

1161500505 is a wasteful number, since it uses less digits than its factorization.

1161500505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69817.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1161500505 is about 34080.7937847697. The cubic root of 1161500505 is about 1051.1704272749.

It can be divided in two parts, 11 and 61500505, that added together give a palindrome (61500516).

The spelling of 1161500505 in words is "one billion, one hundred sixty-one million, five hundred thousand, five hundred five".