1620013503 has 8 divisors (see below), whose sum is σ = 2161415088. Its totient is φ = 1079310464.

The previous prime is 1620013489. The next prime is 1620013523. The reversal of 1620013503 is 3053100261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620013503 - 2¹⁰ = 1620012479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620013503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620013523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169200 + ... + 178517.

It is an arithmetic number, because the mean of its divisors is an integer number (270176886).

Almost surely, 2^1620013503 is an apocalyptic number.

1620013503 is a deficient number, since it is larger than the sum of its proper divisors (541401585).

1620013503 is a wasteful number, since it uses less digits than its factorization.

1620013503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349273.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1620013503 is about 40249.3913370128. The cubic root of 1620013503 is about 1174.4635554563.

Adding to 1620013503 its reverse (3053100261), we get a palindrome (4673113764).

The spelling of 1620013503 in words is "one billion, six hundred twenty million, thirteen thousand, five hundred three".