613741721 has 4 divisors (see below), whose sum is σ = 613992372. Its totient is φ = 613491072.

The previous prime is 613741693. The next prime is 613741727. The reversal of 613741721 is 127147316.

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 316662025 + 297079696 = 17795^2 + 17236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613741721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613741727) 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, 121616 + ... + 126561.

It is an arithmetic number, because the mean of its divisors is an integer number (153498093).

Almost surely, 2^613741721 is an apocalyptic number.

It is an amenable number.

613741721 is a deficient number, since it is larger than the sum of its proper divisors (250651).

613741721 is a wasteful number, since it uses less digits than its factorization.

613741721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250650.

The product of its digits is 7056, while the sum is 32.

The square root of 613741721 is about 24773.8111924669. The cubic root of 613741721 is about 849.8231332119.

The spelling of 613741721 in words is "six hundred thirteen million, seven hundred forty-one thousand, seven hundred twenty-one".