1161316261 has 16 divisors (see below), whose sum is σ = 1343485440. Its totient is φ = 983268720.

The previous prime is 1161316259. The next prime is 1161316307. The reversal of 1161316261 is 1626131611.

It is not a de Polignac number, because 1161316261 - 2¹ = 1161316259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161316201) 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, 281826 + ... + 285916.

It is an arithmetic number, because the mean of its divisors is an integer number (83967840).

Almost surely, 2^1161316261 is an apocalyptic number.

It is an amenable number.

1161316261 is a deficient number, since it is larger than the sum of its proper divisors (182169179).

1161316261 is a wasteful number, since it uses less digits than its factorization.

1161316261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584.

The product of its digits is 1296, while the sum is 28.

The square root of 1161316261 is about 34078.0906301982. The cubic root of 1161316261 is about 1051.1148434030.

Adding to 1161316261 its reverse (1626131611), we get a palindrome (2787447872).

The spelling of 1161316261 in words is "one billion, one hundred sixty-one million, three hundred sixteen thousand, two hundred sixty-one".