726194551 has 4 divisors (see below), whose sum is σ = 730820152. Its totient is φ = 721568952.

The previous prime is 726194549. The next prime is 726194591. The reversal of 726194551 is 155491627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 726194551 - 2¹ = 726194549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726194591) 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 in 3 ways as a sum of consecutive naturals, for example, 2312565 + ... + 2312878.

It is an arithmetic number, because the mean of its divisors is an integer number (182705038).

Almost surely, 2^726194551 is an apocalyptic number.

726194551 is a deficient number, since it is larger than the sum of its proper divisors (4625601).

726194551 is a wasteful number, since it uses less digits than its factorization.

726194551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625600.

The product of its digits is 75600, while the sum is 40.

The square root of 726194551 is about 26947.9971611992. The cubic root of 726194551 is about 898.8440100825.

The spelling of 726194551 in words is "seven hundred twenty-six million, one hundred ninety-four thousand, five hundred fifty-one".