721311241 has 8 divisors (see below), whose sum is σ = 872847360. Its totient is φ = 581898048.

The previous prime is 721311233. The next prime is 721311247. The reversal of 721311241 is 142113127.

It is a happy number.

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 721311241 - 2³ = 721311233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721311247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3030601 + ... + 3030838.

It is an arithmetic number, because the mean of its divisors is an integer number (109105920).

Almost surely, 2^721311241 is an apocalyptic number.

It is an amenable number.

721311241 is a deficient number, since it is larger than the sum of its proper divisors (151536119).

721311241 is a wasteful number, since it uses less digits than its factorization.

721311241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061463.

The product of its digits is 336, while the sum is 22.

The square root of 721311241 is about 26857.2381491471. The cubic root of 721311241 is about 896.8247120950.

Adding to 721311241 its reverse (142113127), we get a palindrome (863424368).

It can be divided in two parts, 7213112 and 41, that multiplied together give a palindrome (295737592).

The spelling of 721311241 in words is "seven hundred twenty-one million, three hundred eleven thousand, two hundred forty-one".