1161331028 has 24 divisors (see below), whose sum is σ = 2387632800. Its totient is φ = 487271520.

The previous prime is 1161331001. The next prime is 1161331049. The reversal of 1161331028 is 8201331611.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 1161330988 and 1161331006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1014578 + ... + 1015721.

It is an arithmetic number, because the mean of its divisors is an integer number (99484700).

Almost surely, 2^1161331028 is an apocalyptic number.

It is an amenable number.

1161331028 is an abundant number, since it is smaller than the sum of its proper divisors (1226301772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161331028 is a wasteful number, since it uses less digits than its factorization.

1161331028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030327 (or 2030325 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1161331028 is about 34078.3072936436. The cubic root of 1161331028 is about 1051.1192986198.

Adding to 1161331028 its reverse (8201331611), we get a palindrome (9362662639).

The spelling of 1161331028 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, twenty-eight".