723211961 has 2 divisors, whose sum is σ = 723211962. Its totient is φ = 723211960.

The previous prime is 723211939. The next prime is 723211963. The reversal of 723211961 is 169112327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607326736 + 115885225 = 24644^2 + 10765^2 .

It is an emirp because it is prime and its reverse (169112327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723211961 is a prime.

Together with 723211963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (723211963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361605980 + 361605981.

It is an arithmetic number, because the mean of its divisors is an integer number (361605981).

Almost surely, 2^723211961 is an apocalyptic number.

It is an amenable number.

723211961 is a deficient number, since it is larger than the sum of its proper divisors (1).

723211961 is an equidigital number, since it uses as much as digits as its factorization.

723211961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 723211961 is about 26892.6004878665. The cubic root of 723211961 is about 897.6117591138.

The spelling of 723211961 in words is "seven hundred twenty-three million, two hundred eleven thousand, nine hundred sixty-one".