1161331023 has 4 divisors (see below), whose sum is σ = 1548441368. Its totient is φ = 774220680.

The previous prime is 1161331001. The next prime is 1161331049. The reversal of 1161331023 is 3201331611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1161331023 - 2¹⁸ = 1161068879 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 (1161331823) 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, 193555168 + ... + 193555173.

It is an arithmetic number, because the mean of its divisors is an integer number (387110342).

Almost surely, 2^1161331023 is an apocalyptic number.

1161331023 is a deficient number, since it is larger than the sum of its proper divisors (387110345).

1161331023 is an equidigital number, since it uses as much as digits as its factorization.

1161331023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387110344.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1161331023 is about 34078.3072202831. The cubic root of 1161331023 is about 1051.1192971113.

Adding to 1161331023 its reverse (3201331611), we get a palindrome (4362662634).

The spelling of 1161331023 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, twenty-three".