726307531 has 2 divisors, whose sum is σ = 726307532. Its totient is φ = 726307530.

The previous prime is 726307513. The next prime is 726307553. The reversal of 726307531 is 135703627.

726307531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (726307513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726307531 - 2⁵ = 726307499 is a prime.

It is a super-2 number, since 2×726307531² = 1055045259174631922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (726307511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363153765 + 363153766.

It is an arithmetic number, because the mean of its divisors is an integer number (363153766).

Almost surely, 2^726307531 is an apocalyptic number.

726307531 is a deficient number, since it is larger than the sum of its proper divisors (1).

726307531 is an equidigital number, since it uses as much as digits as its factorization.

726307531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 34.

The square root of 726307531 is about 26950.0933393560. The cubic root of 726307531 is about 898.8906211595.

The spelling of 726307531 in words is "seven hundred twenty-six million, three hundred seven thousand, five hundred thirty-one".