608817821 has 4 divisors (see below), whose sum is σ = 644630652. Its totient is φ = 573004992.

The previous prime is 608817767. The next prime is 608817823. The reversal of 608817821 is 128718806.

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 368102596 + 240715225 = 19186^2 + 15515^2 .

It is not a de Polignac number, because 608817821 - 2⁶ = 608817757 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 (608817823) 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, 17906390 + ... + 17906423.

It is an arithmetic number, because the mean of its divisors is an integer number (161157663).

Almost surely, 2^608817821 is an apocalyptic number.

It is an amenable number.

608817821 is a deficient number, since it is larger than the sum of its proper divisors (35812831).

608817821 is a wasteful number, since it uses less digits than its factorization.

608817821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35812830.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 608817821 is about 24674.2339496082. The cubic root of 608817821 is about 847.5443871834.

The spelling of 608817821 in words is "six hundred eight million, eight hundred seventeen thousand, eight hundred twenty-one".