726140161 has 4 divisors (see below), whose sum is σ = 727416900. Its totient is φ = 724863424.

The previous prime is 726140137. The next prime is 726140179. The reversal of 726140161 is 161041627.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189337600 + 536802561 = 13760^2 + 23169^2 .

It is a cyclic number.

It is not a de Polignac number, because 726140161 - 2²¹ = 724043009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726140101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637516 + ... + 638653.

It is an arithmetic number, because the mean of its divisors is an integer number (181854225).

Almost surely, 2^726140161 is an apocalyptic number.

It is an amenable number.

726140161 is a deficient number, since it is larger than the sum of its proper divisors (1276739).

726140161 is a wasteful number, since it uses less digits than its factorization.

726140161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276738.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 726140161 is about 26946.9879763954. The cubic root of 726140161 is about 898.8215691970.

Adding to 726140161 its reverse (161041627), we get a palindrome (887181788).

The spelling of 726140161 in words is "seven hundred twenty-six million, one hundred forty thousand, one hundred sixty-one".