1161505 has 8 divisors (see below), whose sum is σ = 1401192. Its totient is φ = 924288.

The previous prime is 1161499. The next prime is 1161509. The reversal of 1161505 is 5051611.

It can be written as a sum of positive squares in 4 ways, for example, as 147456 + 1014049 = 384^2 + 1007^2 .

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 1161505 - 2³ = 1161497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667 + ... + 1663.

It is an arithmetic number, because the mean of its divisors is an integer number (175149).

2^1161505 is an apocalyptic number.

It is an amenable number.

1161505 is a deficient number, since it is larger than the sum of its proper divisors (239687).

1161505 is an equidigital number, since it uses as much as digits as its factorization.

1161505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1161505 is about 1077.7314136648. The cubic root of 1161505 is about 105.1171783281.

It can be divided in two parts, 11 and 61505, that added together give a palindrome (61516).

The spelling of 1161505 in words is "one million, one hundred sixty-one thousand, five hundred five".