722651 has 4 divisors (see below), whose sum is σ = 747600. Its totient is φ = 697704.

The previous prime is 722639. The next prime is 722663. The reversal of 722651 is 156227.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (722639) and next prime (722663).

It is a cyclic number.

It is not a de Polignac number, because 722651 - 2¹⁴ = 706267 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722651.

It is not an unprimeable number, because it can be changed into a prime (722611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12431 + ... + 12488.

It is an arithmetic number, because the mean of its divisors is an integer number (186900).

2⁷²²⁶⁵¹ is an apocalyptic number.

722651 is a deficient number, since it is larger than the sum of its proper divisors (24949).

722651 is a wasteful number, since it uses less digits than its factorization.

722651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24948.

The product of its digits is 840, while the sum is 23.

The square root of 722651 is about 850.0888188889. The cubic root of 722651 is about 89.7379620884.

Adding to 722651 its reverse (156227), we get a palindrome (878878).

The spelling of 722651 in words is "seven hundred twenty-two thousand, six hundred fifty-one".