723123251 has 2 divisors, whose sum is σ = 723123252. Its totient is φ = 723123250.

The previous prime is 723123239. The next prime is 723123253. The reversal of 723123251 is 152321327.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723123251 is a prime.

It is a super-2 number, since 2×723123251² = 1045814472273618002, which contains 22 as substring.

Together with 723123253, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 723123251.

It is not a weakly prime, because it can be changed into another prime (723123253) 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, 361561625 + 361561626.

It is an arithmetic number, because the mean of its divisors is an integer number (361561626).

Almost surely, 2^723123251 is an apocalyptic number.

723123251 is a deficient number, since it is larger than the sum of its proper divisors (1).

723123251 is an equidigital number, since it uses as much as digits as its factorization.

723123251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 723123251 is about 26890.9510988362. The cubic root of 723123251 is about 897.5750569207.

Adding to 723123251 its reverse (152321327), we get a palindrome (875444578).

The spelling of 723123251 in words is "seven hundred twenty-three million, one hundred twenty-three thousand, two hundred fifty-one".