1491005 has 4 divisors (see below), whose sum is σ = 1789212. Its totient is φ = 1192800.

The previous prime is 1491001. The next prime is 1491013. The reversal of 1491005 is 5001941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5001941 = 7 ⋅714563.

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 1249924 = 491^2 + 1118^2 .

It is not a de Polignac number, because 1491005 - 2² = 1491001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149096 + ... + 149105.

It is an arithmetic number, because the mean of its divisors is an integer number (447303).

2^1491005 is an apocalyptic number.

It is an amenable number.

1491005 is a deficient number, since it is larger than the sum of its proper divisors (298207).

1491005 is an equidigital number, since it uses as much as digits as its factorization.

1491005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298206.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1491005 is about 1221.0671562203. The cubic root of 1491005 is about 114.2421496904.

Adding to 1491005 its reverse (5001941), we get a palindrome (6492946).

It can be divided in two parts, 14 and 91005, that added together give a palindrome (91019).

The spelling of 1491005 in words is "one million, four hundred ninety-one thousand, five".