1161287688 has 32 divisors (see below), whose sum is σ = 3167148960. Its totient is φ = 351905280.

The previous prime is 1161287671. The next prime is 1161287689. The reversal of 1161287688 is 8867821611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1161287689) 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 7 ways as a sum of consecutive naturals, for example, 2199145 + ... + 2199672.

It is an arithmetic number, because the mean of its divisors is an integer number (98973405).

Almost surely, 2^1161287688 is an apocalyptic number.

It is an amenable number.

1161287688 is an abundant number, since it is smaller than the sum of its proper divisors (2005861272).

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

1161287688 is a wasteful number, since it uses less digits than its factorization.

1161287688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4398837 (or 4398833 counting only the distinct ones).

The product of its digits is 258048, while the sum is 48.

The square root of 1161287688 is about 34077.6713993195. The cubic root of 1161287688 is about 1051.1062227968.

The spelling of 1161287688 in words is "one billion, one hundred sixty-one million, two hundred eighty-seven thousand, six hundred eighty-eight".