1201321503 has 8 divisors (see below), whose sum is σ = 1779735600. Its totient is φ = 800880984.

The previous prime is 1201321489. The next prime is 1201321519. The reversal of 1201321503 is 3051231021.

It is not a de Polignac number, because 1201321503 - 2¹² = 1201317407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201321543) 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, 22246668 + ... + 22246721.

It is an arithmetic number, because the mean of its divisors is an integer number (222466950).

Almost surely, 2^1201321503 is an apocalyptic number.

1201321503 is a deficient number, since it is larger than the sum of its proper divisors (578414097).

1201321503 is an equidigital number, since it uses as much as digits as its factorization.

1201321503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44493398 (or 44493392 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1201321503 is about 34660.0851556946. The cubic root of 1201321503 is about 1063.0485112114.

Adding to 1201321503 its reverse (3051231021), we get a palindrome (4252552524).

The spelling of 1201321503 in words is "one billion, two hundred one million, three hundred twenty-one thousand, five hundred three".