1531506 has 8 divisors (see below), whose sum is σ = 3063024. Its totient is φ = 510500.

The previous prime is 1531499. The next prime is 1531549. The reversal of 1531506 is 6051351.

It is a happy number.

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

1531506 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127620 + ... + 127631.

It is an arithmetic number, because the mean of its divisors is an integer number (382878).

2^1531506 is an apocalyptic number.

1531506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531506 is a wasteful number, since it uses less digits than its factorization.

1531506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255256.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1531506 is about 1237.5403023740. The cubic root of 1531506 is about 115.2673301908.

Adding to 1531506 its reverse (6051351), we get a palindrome (7582857).

The spelling of 1531506 in words is "one million, five hundred thirty-one thousand, five hundred six".