613604821 has 4 divisors (see below), whose sum is σ = 615458944. Its totient is φ = 611750700.

The previous prime is 613604819. The next prime is 613604839. The reversal of 613604821 is 128406316.

It is a happy number.

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 613604821 - 2¹ = 613604819 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 (613604021) 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, 926565 + ... + 927226.

It is an arithmetic number, because the mean of its divisors is an integer number (153864736).

Almost surely, 2^613604821 is an apocalyptic number.

It is an amenable number.

613604821 is a deficient number, since it is larger than the sum of its proper divisors (1854123).

613604821 is a wasteful number, since it uses less digits than its factorization.

613604821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854122.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 613604821 is about 24771.0480400002. The cubic root of 613604821 is about 849.7599418974.

The spelling of 613604821 in words is "six hundred thirteen million, six hundred four thousand, eight hundred twenty-one".