613013081 has 4 divisors (see below), whose sum is σ = 649072692. Its totient is φ = 576953472.

The previous prime is 613012931. The next prime is 613013087. The reversal of 613013081 is 180310316.

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 372142681 + 240870400 = 19291^2 + 15520^2 .

It is a cyclic number.

It is not a de Polignac number, because 613013081 - 2¹⁸ = 612750937 is a prime.

It is a super-2 number, since 2×613013081² = 751570074954225122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (613013087) 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, 18029780 + ... + 18029813.

It is an arithmetic number, because the mean of its divisors is an integer number (162268173).

Almost surely, 2^613013081 is an apocalyptic number.

It is an amenable number.

613013081 is a deficient number, since it is larger than the sum of its proper divisors (36059611).

613013081 is a wasteful number, since it uses less digits than its factorization.

613013081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36059610.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 613013081 is about 24759.1009731775. The cubic root of 613013081 is about 849.4866940039.

Adding to 613013081 its reverse (180310316), we get a palindrome (793323397).

The spelling of 613013081 in words is "six hundred thirteen million, thirteen thousand, eighty-one".