1161331061 has 4 divisors (see below), whose sum is σ = 1266906624. Its totient is φ = 1055755500.

The previous prime is 1161331051. The next prime is 1161331069. The reversal of 1161331061 is 1601331611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1161331061 - 2¹⁴ = 1161314677 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 (1161331069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52787765 + ... + 52787786.

It is an arithmetic number, because the mean of its divisors is an integer number (316726656).

Almost surely, 2^1161331061 is an apocalyptic number.

1161331061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1161331061 is a deficient number, since it is larger than the sum of its proper divisors (105575563).

1161331061 is a wasteful number, since it uses less digits than its factorization.

1161331061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105575562.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1161331061 is about 34078.3077778225. The cubic root of 1161331061 is about 1051.1193085759.

Adding to 1161331061 its reverse (1601331611), we get a palindrome (2762662672).

The spelling of 1161331061 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, sixty-one".