1165161 has 8 divisors (see below), whose sum is σ = 1579264. Its totient is φ = 763920.

The previous prime is 1165147. The next prime is 1165183. The reversal of 1165161 is 1615611.

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

It is not a de Polignac number, because 1165161 - 2¹⁵ = 1132393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1165121) by changing a digit.

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, 3001 + ... + 3366.

It is an arithmetic number, because the mean of its divisors is an integer number (197408).

2^1165161 is an apocalyptic number.

It is an amenable number.

1165161 is a deficient number, since it is larger than the sum of its proper divisors (414103).

1165161 is an equidigital number, since it uses as much as digits as its factorization.

1165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6431.

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

The square root of 1165161 is about 1079.4262364794. The cubic root of 1165161 is about 105.2273531691.

It can be divided in two parts, 1165 and 161, that added together give a triangular number (1326 = T₅₁).

The spelling of 1165161 in words is "one million, one hundred sixty-five thousand, one hundred sixty-one".