1161391087 has 8 divisors (see below), whose sum is σ = 1176733440. Its totient is φ = 1146064920.

The previous prime is 1161391073. The next prime is 1161391097. The reversal of 1161391087 is 7801931611.

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

It is a cyclic number.

It is not a de Polignac number, because 1161391087 - 2¹⁹ = 1160866799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161391097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222012 + ... + 227182.

It is an arithmetic number, because the mean of its divisors is an integer number (147091680).

Almost surely, 2^1161391087 is an apocalyptic number.

1161391087 is a deficient number, since it is larger than the sum of its proper divisors (15342353).

1161391087 is an equidigital number, since it uses as much as digits as its factorization.

1161391087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8093.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 1161391087 is about 34079.1884733190. The cubic root of 1161391087 is about 1051.1374180834.

The spelling of 1161391087 in words is "one billion, one hundred sixty-one million, three hundred ninety-one thousand, eighty-seven".