1531005 has 24 divisors (see below), whose sum is σ = 2850912. Its totient is φ = 699552.

The previous prime is 1530967. The next prime is 1531021. The reversal of 1531005 is 5001351.

It is not a de Polignac number, because 1531005 - 2¹² = 1526909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (118788).

2^1531005 is an apocalyptic number.

1531005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1531005 is a deficient number, since it is larger than the sum of its proper divisors (1319907).

1531005 is a wasteful number, since it uses less digits than its factorization.

1531005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 75, while the sum is 15.

The square root of 1531005 is about 1237.3378681670. The cubic root of 1531005 is about 115.2547597252.

Adding to 1531005 its reverse (5001351), we get a palindrome (6532356).

The spelling of 1531005 in words is "one million, five hundred thirty-one thousand, five".