1301520503 has 4 divisors (see below), whose sum is σ = 1301596608. Its totient is φ = 1301444400.

The previous prime is 1301520449. The next prime is 1301520509. The reversal of 1301520503 is 3050251031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3050251031 = 317 ⋅9622243.

It is a cyclic number.

It is not a de Polignac number, because 1301520503 - 2²⁰ = 1300471927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301520509) 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, 875 + ... + 51027.

It is an arithmetic number, because the mean of its divisors is an integer number (325399152).

Almost surely, 2^1301520503 is an apocalyptic number.

1301520503 is a deficient number, since it is larger than the sum of its proper divisors (76105).

1301520503 is an equidigital number, since it uses as much as digits as its factorization.

1301520503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76104.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 1301520503 is about 36076.5921755368. The cubic root of 1301520503 is about 1091.8182214182.

Adding to 1301520503 its reverse (3050251031), we get a palindrome (4351771534).

The spelling of 1301520503 in words is "one billion, three hundred one million, five hundred twenty thousand, five hundred three".