1301721 has 8 divisors (see below), whose sum is σ = 1791744. Its totient is φ = 839760.

The previous prime is 1301719. The next prime is 1301761. The reversal of 1301721 is 1271031.

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

It is not a de Polignac number, because 1301721 - 2¹ = 1301719 is a prime.

It is a Curzon number.

1301721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1301721.

It is not an unprimeable number, because it can be changed into a prime (1301701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6906 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (223968).

2^1301721 is an apocalyptic number.

It is an amenable number.

1301721 is a deficient number, since it is larger than the sum of its proper divisors (490023).

1301721 is a wasteful number, since it uses less digits than its factorization.

1301721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14031.

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

The square root of 1301721 is about 1140.9298839105. The cubic root of 1301721 is about 109.1874282781.

Adding to 1301721 its reverse (1271031), we get a palindrome (2572752).

The spelling of 1301721 in words is "one million, three hundred one thousand, seven hundred twenty-one".