721335141 has 12 divisors (see below), whose sum is σ = 1061588268. Its totient is φ = 471816384.

The previous prime is 721335107. The next prime is 721335151. The reversal of 721335141 is 141533127.

It can be written as a sum of positive squares in 2 ways, for example, as 253478241 + 467856900 = 15921^2 + 21630^2 .

It is not a de Polignac number, because 721335141 - 2¹⁷ = 721204069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721335151) 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 11 ways as a sum of consecutive naturals, for example, 755640 + ... + 756593.

It is an arithmetic number, because the mean of its divisors is an integer number (88465689).

Almost surely, 2^721335141 is an apocalyptic number.

It is an amenable number.

721335141 is a deficient number, since it is larger than the sum of its proper divisors (340253127).

721335141 is a wasteful number, since it uses less digits than its factorization.

721335141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512292 (or 1512289 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 721335141 is about 26857.6830906912. The cubic root of 721335141 is about 896.8346171460.

Adding to 721335141 its reverse (141533127), we get a palindrome (862868268).

The spelling of 721335141 in words is "seven hundred twenty-one million, three hundred thirty-five thousand, one hundred forty-one".