1181485 has 4 divisors (see below), whose sum is σ = 1417788. Its totient is φ = 945184.

The previous prime is 1181473. The next prime is 1181501. The reversal of 1181485 is 5841811.

1181485 = T₈₈₆ + T₈₈₇ + T₈₈₈.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5841811 = 1879 ⋅3109.

It can be written as a sum of positive squares in 2 ways, for example, as 145161 + 1036324 = 381^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181485 - 2¹⁹ = 657197 is a prime.

It is a Duffinian number.

1181485 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118144 + ... + 118153.

It is an arithmetic number, because the mean of its divisors is an integer number (354447).

2^1181485 is an apocalyptic number.

1181485 is the 888-th centered triangular number.

It is an amenable number.

1181485 is a deficient number, since it is larger than the sum of its proper divisors (236303).

1181485 is an equidigital number, since it uses as much as digits as its factorization.

1181485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236302.

The product of its digits is 1280, while the sum is 28.

The square root of 1181485 is about 1086.9613608588. The cubic root of 1181485 is about 105.7164905276.

The spelling of 1181485 in words is "one million, one hundred eighty-one thousand, four hundred eighty-five".