722116817 has 4 divisors (see below), whose sum is σ = 722179380. Its totient is φ = 722054256.

The previous prime is 722116799. The next prime is 722116859. The reversal of 722116817 is 718611227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 718611227 = 43 ⋅16711889.

It can be written as a sum of positive squares in 2 ways, for example, as 362483521 + 359633296 = 19039^2 + 18964^2 .

It is a cyclic number.

It is not a de Polignac number, because 722116817 - 2¹⁸ = 721854673 is a prime.

It is a super-2 number, since 2×722116817² = 1042905394788422978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722116867) 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, 8378 + ... + 38915.

It is an arithmetic number, because the mean of its divisors is an integer number (180544845).

Almost surely, 2^722116817 is an apocalyptic number.

It is an amenable number.

722116817 is a deficient number, since it is larger than the sum of its proper divisors (62563).

722116817 is a wasteful number, since it uses less digits than its factorization.

722116817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62562.

The product of its digits is 9408, while the sum is 35.

The square root of 722116817 is about 26872.2313364559. The cubic root of 722116817 is about 897.1584522970.

The spelling of 722116817 in words is "seven hundred twenty-two million, one hundred sixteen thousand, eight hundred seventeen".