723121739 has 2 divisors, whose sum is σ = 723121740. Its totient is φ = 723121738.

The previous prime is 723121661. The next prime is 723121807. The reversal of 723121739 is 937121327.

It is a strong prime.

It is an emirp because it is prime and its reverse (937121327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723121739 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 723121699 and 723121708.

It is not a weakly prime, because it can be changed into another prime (723127739) 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, 361560869 + 361560870.

It is an arithmetic number, because the mean of its divisors is an integer number (361560870).

Almost surely, 2^723121739 is an apocalyptic number.

723121739 is a deficient number, since it is larger than the sum of its proper divisors (1).

723121739 is an equidigital number, since it uses as much as digits as its factorization.

723121739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 35.

The square root of 723121739 is about 26890.9229852752. The cubic root of 723121739 is about 897.5744313315.

The spelling of 723121739 in words is "seven hundred twenty-three million, one hundred twenty-one thousand, seven hundred thirty-nine".