726646631 has 2 divisors, whose sum is σ = 726646632. Its totient is φ = 726646630.

The previous prime is 726646619. The next prime is 726646633. The reversal of 726646631 is 136646627.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726646631 is a prime.

It is a super-2 number, since 2×726646631² = 1056030652687300322, which contains 22 as substring.

Together with 726646633, 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 (726646633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363323315 + 363323316.

It is an arithmetic number, because the mean of its divisors is an integer number (363323316).

Almost surely, 2^726646631 is an apocalyptic number.

726646631 is a deficient number, since it is larger than the sum of its proper divisors (1).

726646631 is an equidigital number, since it uses as much as digits as its factorization.

726646631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 41.

The square root of 726646631 is about 26956.3838635675. The cubic root of 726646631 is about 899.0304913804.

The spelling of 726646631 in words is "seven hundred twenty-six million, six hundred forty-six thousand, six hundred thirty-one".