1501503 has 4 divisors (see below), whose sum is σ = 2002008. Its totient is φ = 1001000.

The previous prime is 1501501. The next prime is 1501523. The reversal of 1501503 is 3051051.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1501503 - 2¹ = 1501501 is a prime.

It is a super-2 number, since 2×1501503² = 4509022518018, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1501501) 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, 250248 + ... + 250253.

It is an arithmetic number, because the mean of its divisors is an integer number (500502).

2^1501503 is an apocalyptic number.

1501503 is a deficient number, since it is larger than the sum of its proper divisors (500505).

1501503 is an equidigital number, since it uses as much as digits as its factorization.

1501503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500504.

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

The square root of 1501503 is about 1225.3583149430. The cubic root of 1501503 is about 114.5096449482.

Adding to 1501503 its reverse (3051051), we get a palindrome (4552554).

It can be divided in two parts, 150 and 1503, that added together give a triangular number (1653 = T₅₇).

The spelling of 1501503 in words is "one million, five hundred one thousand, five hundred three".