1161591447 has 8 divisors (see below), whose sum is σ = 1559931520. Its totient is φ = 768822840.

The previous prime is 1161591439. The next prime is 1161591479. The reversal of 1161591447 is 7441951611.

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

It is not a de Polignac number, because 1161591447 - 2³ = 1161591439 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 (1161591437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392379 + ... + 1393212.

It is an arithmetic number, because the mean of its divisors is an integer number (194991440).

Almost surely, 2^1161591447 is an apocalyptic number.

1161591447 is a deficient number, since it is larger than the sum of its proper divisors (398340073).

1161591447 is a wasteful number, since it uses less digits than its factorization.

1161591447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785733.

The product of its digits is 30240, while the sum is 39.

The square root of 1161591447 is about 34082.1279705361. The cubic root of 1161591447 is about 1051.1978610543.

The spelling of 1161591447 in words is "one billion, one hundred sixty-one million, five hundred ninety-one thousand, four hundred forty-seven".