721440601 has 4 divisors (see below), whose sum is σ = 824503552. Its totient is φ = 618377652.

The previous prime is 721440593. The next prime is 721440617. The reversal of 721440601 is 106044127.

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 721440601 - 2³ = 721440593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721441601) 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 3 ways as a sum of consecutive naturals, for example, 51531465 + ... + 51531478.

It is an arithmetic number, because the mean of its divisors is an integer number (206125888).

Almost surely, 2^721440601 is an apocalyptic number.

It is an amenable number.

721440601 is a deficient number, since it is larger than the sum of its proper divisors (103062951).

721440601 is a wasteful number, since it uses less digits than its factorization.

721440601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103062950.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 721440601 is about 26859.6463305085. The cubic root of 721440601 is about 896.8783210891.

Adding to 721440601 its reverse (106044127), we get a palindrome (827484728).

The spelling of 721440601 in words is "seven hundred twenty-one million, four hundred forty thousand, six hundred one".