721548851 has 2 divisors, whose sum is σ = 721548852. Its totient is φ = 721548850.

The previous prime is 721548827. The next prime is 721548853. The reversal of 721548851 is 158845127.

721548851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721548851 is a prime.

Together with 721548853, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 721548799 and 721548808.

It is not a weakly prime, because it can be changed into another prime (721548853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360774425 + 360774426.

It is an arithmetic number, because the mean of its divisors is an integer number (360774426).

Almost surely, 2^721548851 is an apocalyptic number.

721548851 is a deficient number, since it is larger than the sum of its proper divisors (1).

721548851 is an equidigital number, since it uses as much as digits as its factorization.

721548851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 41.

The square root of 721548851 is about 26861.6613596404. The cubic root of 721548851 is about 896.9231768137.

The spelling of 721548851 in words is "seven hundred twenty-one million, five hundred forty-eight thousand, eight hundred fifty-one".