717720401 has 4 divisors (see below), whose sum is σ = 740872704. Its totient is φ = 694568100.

The previous prime is 717720397. The next prime is 717720403. The reversal of 717720401 is 104027717.

717720401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 104027717 = 19 ⋅5475143.

It is a cyclic number.

It is not a de Polignac number, because 717720401 - 2² = 717720397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (717720403) 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, 11576105 + ... + 11576166.

It is an arithmetic number, because the mean of its divisors is an integer number (185218176).

Almost surely, 2^717720401 is an apocalyptic number.

It is an amenable number.

717720401 is a deficient number, since it is larger than the sum of its proper divisors (23152303).

717720401 is a wasteful number, since it uses less digits than its factorization.

717720401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23152302.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 717720401 is about 26790.3042349280. The cubic root of 717720401 is about 895.3340413265.

The spelling of 717720401 in words is "seven hundred seventeen million, seven hundred twenty thousand, four hundred one".