1161605215 has 16 divisors (see below), whose sum is σ = 1404112320. Its totient is φ = 922520320.

The previous prime is 1161605201. The next prime is 1161605219. The reversal of 1161605215 is 5125061611.

It is a happy number.

It is not a de Polignac number, because 1161605215 - 2⁵ = 1161605183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161605219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416907 + ... + 419683.

It is an arithmetic number, because the mean of its divisors is an integer number (87757020).

Almost surely, 2^1161605215 is an apocalyptic number.

1161605215 is a deficient number, since it is larger than the sum of its proper divisors (242507105).

1161605215 is a wasteful number, since it uses less digits than its factorization.

1161605215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1161605215 is about 34082.3299526309. The cubic root of 1161605215 is about 1051.2020142171.

Adding to 1161605215 its reverse (5125061611), we get a palindrome (6286666826).

The spelling of 1161605215 in words is "one billion, one hundred sixty-one million, six hundred five thousand, two hundred fifteen".