726631613 has 2 divisors, whose sum is σ = 726631614. Its totient is φ = 726631612.

The previous prime is 726631601. The next prime is 726631621. The reversal of 726631613 is 316136627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 694164409 + 32467204 = 26347^2 + 5698^2 .

It is a cyclic number.

It is not a de Polignac number, because 726631613 - 2⁴ = 726631597 is a prime.

It is a Chen prime.

It is equal to p_37559321 and since 726631613 and 37559321 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726601613) 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, 363315806 + 363315807.

It is an arithmetic number, because the mean of its divisors is an integer number (363315807).

Almost surely, 2^726631613 is an apocalyptic number.

It is an amenable number.

726631613 is a deficient number, since it is larger than the sum of its proper divisors (1).

726631613 is an equidigital number, since it uses as much as digits as its factorization.

726631613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 726631613 is about 26956.1053010260. The cubic root of 726631613 is about 899.0242977542.

The spelling of 726631613 in words is "seven hundred twenty-six million, six hundred thirty-one thousand, six hundred thirteen".