1320220501 has 4 divisors (see below), whose sum is σ = 1321130572. Its totient is φ = 1319310432.

The previous prime is 1320220481. The next prime is 1320220523. The reversal of 1320220501 is 1050220231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1050220231 = 19 ⋅55274749.

It can be written as a sum of positive squares in 2 ways, for example, as 1238336100 + 81884401 = 35190^2 + 9049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320220501 - 2⁵ = 1320220469 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 (1320220001) 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, 452856 + ... + 455761.

It is an arithmetic number, because the mean of its divisors is an integer number (330282643).

Almost surely, 2^1320220501 is an apocalyptic number.

It is an amenable number.

1320220501 is a deficient number, since it is larger than the sum of its proper divisors (910071).

1320220501 is an equidigital number, since it uses as much as digits as its factorization.

1320220501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910070.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1320220501 is about 36334.8386675928. The cubic root of 1320220501 is about 1097.0223881630.

Adding to 1320220501 its reverse (1050220231), we get a palindrome (2370440732).

The spelling of 1320220501 in words is "one billion, three hundred twenty million, two hundred twenty thousand, five hundred one".