721958953 has 2 divisors, whose sum is σ = 721958954. Its totient is φ = 721958952.

The previous prime is 721958917. The next prime is 721958957. The reversal of 721958953 is 359859127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449312809 + 272646144 = 21197^2 + 16512^2 .

It is a cyclic number.

It is not a de Polignac number, because 721958953 - 2⁹ = 721958441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721958897 and 721958906.

It is not a weakly prime, because it can be changed into another prime (721958957) 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 as a sum of consecutive naturals, namely, 360979476 + 360979477.

It is an arithmetic number, because the mean of its divisors is an integer number (360979477).

Almost surely, 2^721958953 is an apocalyptic number.

It is an amenable number.

721958953 is a deficient number, since it is larger than the sum of its proper divisors (1).

721958953 is an equidigital number, since it uses as much as digits as its factorization.

721958953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 49.

The square root of 721958953 is about 26869.2938686524. The cubic root of 721958953 is about 897.0930707500.

The spelling of 721958953 in words is "seven hundred twenty-one million, nine hundred fifty-eight thousand, nine hundred fifty-three".