1013721 has 4 divisors (see below), whose sum is σ = 1351632. Its totient is φ = 675812.

The previous prime is 1013717. The next prime is 1013729. The reversal of 1013721 is 1273101.

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 1013721 - 2² = 1013717 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1013721.

It is not an unprimeable number, because it can be changed into a prime (1013729) 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, 168951 + ... + 168956.

It is an arithmetic number, because the mean of its divisors is an integer number (337908).

2^1013721 is an apocalyptic number.

It is an amenable number.

1013721 is a deficient number, since it is larger than the sum of its proper divisors (337911).

1013721 is an equidigital number, since it uses as much as digits as its factorization.

1013721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337910.

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

The square root of 1013721 is about 1006.8371268482. The cubic root of 1013721 is about 100.4552906252.

Adding to 1013721 its reverse (1273101), we get a palindrome (2286822).

It can be divided in two parts, 10 and 13721, that added together give a palindrome (13731).

The spelling of 1013721 in words is "one million, thirteen thousand, seven hundred twenty-one".