608991 has 8 divisors (see below), whose sum is σ = 859824. Its totient is φ = 382080.

The previous prime is 608989. The next prime is 608999. The reversal of 608991 is 199806.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 608991 - 2¹ = 608989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (608999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5920 + ... + 6021.

It is an arithmetic number, because the mean of its divisors is an integer number (107478).

2⁶⁰⁸⁹⁹¹ is an apocalyptic number.

608991 is a deficient number, since it is larger than the sum of its proper divisors (250833).

608991 is a wasteful number, since it uses less digits than its factorization.

608991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11961.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 608991 is about 780.3787541957. The cubic root of 608991 is about 84.7624741256.

The spelling of 608991 in words is "six hundred eight thousand, nine hundred ninety-one".