729521941 has 4 divisors (see below), whose sum is σ = 754677900. Its totient is φ = 704365984.

The previous prime is 729521939. The next prime is 729521953. The reversal of 729521941 is 149125927.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 149125927 = 19 ⋅7848733.

It can be written as a sum of positive squares in 2 ways, for example, as 351375025 + 378146916 = 18745^2 + 19446^2 .

It is a cyclic number.

It is not a de Polignac number, because 729521941 - 2¹ = 729521939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 729521894 and 729521903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729521971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12577936 + ... + 12577993.

It is an arithmetic number, because the mean of its divisors is an integer number (188669475).

Almost surely, 2^729521941 is an apocalyptic number.

It is an amenable number.

729521941 is a deficient number, since it is larger than the sum of its proper divisors (25155959).

729521941 is a wasteful number, since it uses less digits than its factorization.

729521941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25155958.

The product of its digits is 45360, while the sum is 40.

The square root of 729521941 is about 27009.6638446316. The cubic root of 729521941 is about 900.2147392943.

The spelling of 729521941 in words is "seven hundred twenty-nine million, five hundred twenty-one thousand, nine hundred forty-one".