1161521331 has 8 divisors (see below), whose sum is σ = 1562903760. Its totient is φ = 767243232.

The previous prime is 1161521303. The next prime is 1161521351. The reversal of 1161521331 is 1331251611.

1161521331 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1161521331 - 2⁹ = 1161520819 is a prime.

It is a super-2 number, since 2×1161521331² = 2698263604736023122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161521351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775700 + ... + 1776353.

It is an arithmetic number, because the mean of its divisors is an integer number (195362970).

Almost surely, 2^1161521331 is an apocalyptic number.

1161521331 is a deficient number, since it is larger than the sum of its proper divisors (401382429).

1161521331 is a wasteful number, since it uses less digits than its factorization.

1161521331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552165.

The product of its digits is 540, while the sum is 24.

The square root of 1161521331 is about 34081.0993220583. The cubic root of 1161521331 is about 1051.1767098218.

Adding to 1161521331 its reverse (1331251611), we get a palindrome (2492772942).

The spelling of 1161521331 in words is "one billion, one hundred sixty-one million, five hundred twenty-one thousand, three hundred thirty-one".