1310721 has 8 divisors (see below), whose sum is σ = 1773984. Its totient is φ = 860640.

The previous prime is 1310719. The next prime is 1310723. The reversal of 1310721 is 1270131.

It is an interprime number because it is at equal distance from previous prime (1310719) and next prime (1310723).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1310721 - 2¹ = 1310719 is a prime.

1310721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1310721.

It is not an unprimeable number, because it can be changed into a prime (1310723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3060 + ... + 3461.

It is an arithmetic number, because the mean of its divisors is an integer number (221748).

It is a Proth number, since it is equal to 5 ⋅ 2¹⁸ + 1 and 5 < 2¹⁸.

2^1310721 is an apocalyptic number.

It is an amenable number.

1310721 is a deficient number, since it is larger than the sum of its proper divisors (463263).

1310721 is an equidigital number, since it uses as much as digits as its factorization.

1310721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 1310721 is about 1144.8672412118. The cubic root of 1310721 is about 109.4384884189.

Adding to 1310721 its reverse (1270131), we get a palindrome (2580852).

The spelling of 1310721 in words is "one million, three hundred ten thousand, seven hundred twenty-one".