613439965 has 4 divisors (see below), whose sum is σ = 736127964. Its totient is φ = 490751968.

The previous prime is 613439941. The next prime is 613439989. The reversal of 613439965 is 569934316.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (613439941) and next prime (613439989).

It can be written as a sum of positive squares in 2 ways, for example, as 80892036 + 532547929 = 8994^2 + 23077^2 .

It is a cyclic number.

It is not a de Polignac number, because 613439965 - 2¹³ = 613431773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61343992 + ... + 61344001.

It is an arithmetic number, because the mean of its divisors is an integer number (184031991).

Almost surely, 2^613439965 is an apocalyptic number.

It is an amenable number.

613439965 is a deficient number, since it is larger than the sum of its proper divisors (122687999).

613439965 is a wasteful number, since it uses less digits than its factorization.

613439965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122687998.

The product of its digits is 524880, while the sum is 46.

The square root of 613439965 is about 24767.7202220955. The cubic root of 613439965 is about 849.6838339705.

The spelling of 613439965 in words is "six hundred thirteen million, four hundred thirty-nine thousand, nine hundred sixty-five".