613086821 has 4 divisors (see below), whose sum is σ = 615787872. Its totient is φ = 610385772.

The previous prime is 613086809. The next prime is 613086829. The reversal of 613086821 is 128680316.

613086821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 613086821 - 2⁶ = 613086757 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 (613086829) 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, 1350185 + ... + 1350638.

It is an arithmetic number, because the mean of its divisors is an integer number (153946968).

Almost surely, 2^613086821 is an apocalyptic number.

It is an amenable number.

613086821 is a deficient number, since it is larger than the sum of its proper divisors (2701051).

613086821 is a wasteful number, since it uses less digits than its factorization.

613086821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701050.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 613086821 is about 24760.5900777829. The cubic root of 613086821 is about 849.5207545263.

The spelling of 613086821 in words is "six hundred thirteen million, eighty-six thousand, eight hundred twenty-one".