731121 has 4 divisors (see below), whose sum is σ = 974832. Its totient is φ = 487412.

The previous prime is 731117. The next prime is 731141. The reversal of 731121 is 121137.

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 731121 - 2² = 731117 is a prime.

It is a D-number.

731121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 731121.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 731121.

It is not an unprimeable number, because it can be changed into a prime (731141) 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, 121851 + ... + 121856.

It is an arithmetic number, because the mean of its divisors is an integer number (243708).

2⁷³¹¹²¹ is an apocalyptic number.

It is an amenable number.

731121 is a deficient number, since it is larger than the sum of its proper divisors (243711).

731121 is a wasteful number, since it uses less digits than its factorization.

731121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243710.

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

The square root of 731121 is about 855.0561385079. The cubic root of 731121 is about 90.0871994373.

Adding to 731121 its reverse (121137), we get a palindrome (852258).

The spelling of 731121 in words is "seven hundred thirty-one thousand, one hundred twenty-one".