616240613 has 4 divisors (see below), whose sum is σ = 616724460. Its totient is φ = 615756768.

The previous prime is 616240609. The next prime is 616240621. The reversal of 616240613 is 316042616.

It is a happy number.

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 183683809 + 432556804 = 13553^2 + 20798^2 .

It is a cyclic number.

It is not a de Polignac number, because 616240613 - 2² = 616240609 is a prime.

It is a super-2 number, since 2×616240613² = 759504986221231538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616240643) 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, 240008 + ... + 242561.

It is an arithmetic number, because the mean of its divisors is an integer number (154181115).

Almost surely, 2^616240613 is an apocalyptic number.

It is an amenable number.

616240613 is a deficient number, since it is larger than the sum of its proper divisors (483847).

616240613 is a wasteful number, since it uses less digits than its factorization.

616240613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483846.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 616240613 is about 24824.1941057509. The cubic root of 616240613 is about 850.9749426826.

The spelling of 616240613 in words is "six hundred sixteen million, two hundred forty thousand, six hundred thirteen".