1321004501 has 4 divisors (see below), whose sum is σ = 1326928512. Its totient is φ = 1315080492.

The previous prime is 1321004473. The next prime is 1321004521. The reversal of 1321004501 is 1054001231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321004501 - 2¹⁴ = 1320988117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321004501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321004521) 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, 2961671 + ... + 2962116.

It is an arithmetic number, because the mean of its divisors is an integer number (331732128).

Almost surely, 2^1321004501 is an apocalyptic number.

It is an amenable number.

1321004501 is a deficient number, since it is larger than the sum of its proper divisors (5924011).

1321004501 is an equidigital number, since it uses as much as digits as its factorization.

1321004501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5924010.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1321004501 is about 36345.6256102437. The cubic root of 1321004501 is about 1097.2394971890.

Adding to 1321004501 its reverse (1054001231), we get a palindrome (2375005732).

The spelling of 1321004501 in words is "one billion, three hundred twenty-one million, four thousand, five hundred one".