1320652721 has 8 divisors (see below), whose sum is σ = 1367983080. Its totient is φ = 1273441792.

The previous prime is 1320652699. The next prime is 1320652727. The reversal of 1320652721 is 1272560231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79852096 + 1240800625 = 8936^2 + 35225^2 .

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 1320652721 - 2¹⁴ = 1320636337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320652727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7040 + ... + 51873.

It is an arithmetic number, because the mean of its divisors is an integer number (170997885).

Almost surely, 2^1320652721 is an apocalyptic number.

It is an amenable number.

1320652721 is a deficient number, since it is larger than the sum of its proper divisors (47330359).

1320652721 is an equidigital number, since it uses as much as digits as its factorization.

1320652721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59715.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1320652721 is about 36340.7859161026. The cubic root of 1320652721 is about 1097.1420912181.

The spelling of 1320652721 in words is "one billion, three hundred twenty million, six hundred fifty-two thousand, seven hundred twenty-one".