723251861 has 2 divisors, whose sum is σ = 723251862. Its totient is φ = 723251860.

The previous prime is 723251831. The next prime is 723251863. The reversal of 723251861 is 168152327.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660747025 + 62504836 = 25705^2 + 7906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723251861 is a prime.

Together with 723251863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723251863) 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, 361625930 + 361625931.

It is an arithmetic number, because the mean of its divisors is an integer number (361625931).

Almost surely, 2^723251861 is an apocalyptic number.

It is an amenable number.

723251861 is a deficient number, since it is larger than the sum of its proper divisors (1).

723251861 is an equidigital number, since it uses as much as digits as its factorization.

723251861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 723251861 is about 26893.3423173841. The cubic root of 723251861 is about 897.6282660544.

The spelling of 723251861 in words is "seven hundred twenty-three million, two hundred fifty-one thousand, eight hundred sixty-one".