613366021 has 4 divisors (see below), whose sum is σ = 613491232. Its totient is φ = 613240812.

The previous prime is 613366009. The next prime is 613366043. The reversal of 613366021 is 120663316.

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 613366021 - 2⁵ = 613365989 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 (613366421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54945 + ... + 65158.

It is an arithmetic number, because the mean of its divisors is an integer number (153372808).

Almost surely, 2^613366021 is an apocalyptic number.

It is an amenable number.

613366021 is a deficient number, since it is larger than the sum of its proper divisors (125211).

613366021 is a wasteful number, since it uses less digits than its factorization.

613366021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125210.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 613366021 is about 24766.2274276887. The cubic root of 613366021 is about 849.6496923269.

The spelling of 613366021 in words is "six hundred thirteen million, three hundred sixty-six thousand, twenty-one".