726561401 has 4 divisors (see below), whose sum is σ = 726615972. Its totient is φ = 726506832.

The previous prime is 726561373. The next prime is 726561403. The reversal of 726561401 is 104165627.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 104165627 = 139 ⋅749393.

It can be written as a sum of positive squares in 2 ways, for example, as 310605376 + 415956025 = 17624^2 + 20395^2 .

It is a cyclic number.

It is not a de Polignac number, because 726561401 - 2²⁶ = 659452537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726561403) 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, 7295 + ... + 38811.

It is an arithmetic number, because the mean of its divisors is an integer number (181653993).

Almost surely, 2^726561401 is an apocalyptic number.

It is an amenable number.

726561401 is a deficient number, since it is larger than the sum of its proper divisors (54571).

726561401 is a wasteful number, since it uses less digits than its factorization.

726561401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54570.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 726561401 is about 26954.8029300902. The cubic root of 726561401 is about 898.9953402439.

The spelling of 726561401 in words is "seven hundred twenty-six million, five hundred sixty-one thousand, four hundred one".