722000891 has 4 divisors (see below), whose sum is σ = 722111352. Its totient is φ = 721890432.

The previous prime is 722000861. The next prime is 722000921. The reversal of 722000891 is 198000227.

It is a happy number.

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 (722000861) and next prime (722000921).

It is a cyclic number.

It is not a de Polignac number, because 722000891 - 2⁶ = 722000827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722000801) 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, 44765 + ... + 58718.

It is an arithmetic number, because the mean of its divisors is an integer number (180527838).

Almost surely, 2^722000891 is an apocalyptic number.

722000891 is a deficient number, since it is larger than the sum of its proper divisors (110461).

722000891 is a wasteful number, since it uses less digits than its factorization.

722000891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110460.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 722000891 is about 26870.0742648769. The cubic root of 722000891 is about 897.1104408792.

The spelling of 722000891 in words is "seven hundred twenty-two million, eight hundred ninety-one", and thus it is an aban number.