613663871 has 4 divisors (see below), whose sum is σ = 613725144. Its totient is φ = 613602600.

The previous prime is 613663847. The next prime is 613663891. The reversal of 613663871 is 178366316.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 613663871 - 2¹⁸ = 613401727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613663891) 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, 11720 + ... + 36941.

It is an arithmetic number, because the mean of its divisors is an integer number (153431286).

Almost surely, 2^613663871 is an apocalyptic number.

613663871 is a deficient number, since it is larger than the sum of its proper divisors (61273).

613663871 is a wasteful number, since it uses less digits than its factorization.

613663871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61272.

The product of its digits is 108864, while the sum is 41.

The square root of 613663871 is about 24772.2399269828. The cubic root of 613663871 is about 849.7871997857.

It can be divided in two parts, 6136 and 63871, that added together give a palindrome (70007).

The spelling of 613663871 in words is "six hundred thirteen million, six hundred sixty-three thousand, eight hundred seventy-one".