613854721 has 4 divisors (see below), whose sum is σ = 614919172. Its totient is φ = 612790272.

The previous prime is 613854697. The next prime is 613854743. The reversal of 613854721 is 127458316.

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 587383696 + 26471025 = 24236^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 613854721 - 2⁹ = 613854209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613854781) 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, 531360 + ... + 532513.

It is an arithmetic number, because the mean of its divisors is an integer number (153729793).

Almost surely, 2^613854721 is an apocalyptic number.

It is an amenable number.

613854721 is a deficient number, since it is larger than the sum of its proper divisors (1064451).

613854721 is a wasteful number, since it uses less digits than its factorization.

613854721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064450.

The product of its digits is 40320, while the sum is 37.

The square root of 613854721 is about 24776.0917216578. The cubic root of 613854721 is about 849.8752855086.

The spelling of 613854721 in words is "six hundred thirteen million, eight hundred fifty-four thousand, seven hundred twenty-one".