1620535503 has 4 divisors (see below), whose sum is σ = 2160714008. Its totient is φ = 1080357000.

The previous prime is 1620535451. The next prime is 1620535507. The reversal of 1620535503 is 3055350261.

1620535503 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1620535503 - 2⁸ = 1620535247 is a prime.

It is a super-2 number, since 2×1620535503² = 5252270632966926018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620535507) 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, 270089248 + ... + 270089253.

It is an arithmetic number, because the mean of its divisors is an integer number (540178502).

Almost surely, 2^1620535503 is an apocalyptic number.

1620535503 is a deficient number, since it is larger than the sum of its proper divisors (540178505).

1620535503 is an equidigital number, since it uses as much as digits as its factorization.

1620535503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540178504.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 1620535503 is about 40255.8753848429. The cubic root of 1620535503 is about 1174.5896869440.

Adding to 1620535503 its reverse (3055350261), we get a palindrome (4675885764).

The spelling of 1620535503 in words is "one billion, six hundred twenty million, five hundred thirty-five thousand, five hundred three".