1156161 has 8 divisors (see below), whose sum is σ = 1550880. Its totient is φ = 766112.

The previous prime is 1156157. The next prime is 1156171. The reversal of 1156161 is 1616511.

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 1156161 - 2² = 1156157 is a prime.

1156161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1156121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (193860).

2^1156161 is an apocalyptic number.

It is an amenable number.

1156161 is a deficient number, since it is larger than the sum of its proper divisors (394719).

1156161 is a wasteful number, since it uses less digits than its factorization.

1156161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335.

The product of its digits is 180, while the sum is 21.

The square root of 1156161 is about 1075.2492734245. The cubic root of 1156161 is about 104.9557182891.

The spelling of 1156161 in words is "one million, one hundred fifty-six thousand, one hundred sixty-one".