608691721 has 8 divisors (see below), whose sum is σ = 668426688. Its totient is φ = 549690000.

The previous prime is 608691719. The next prime is 608691791. The reversal of 608691721 is 127196806.

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

It is a cyclic number.

It is not a de Polignac number, because 608691721 - 2¹ = 608691719 is a prime.

It is a super-2 number, since 2×608691721² = 741011222427883682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (608691791) 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 7 ways as a sum of consecutive naturals, for example, 181570 + ... + 184891.

It is an arithmetic number, because the mean of its divisors is an integer number (83553336).

Almost surely, 2^608691721 is an apocalyptic number.

It is an amenable number.

608691721 is a deficient number, since it is larger than the sum of its proper divisors (59734967).

608691721 is a wasteful number, since it uses less digits than its factorization.

608691721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366623.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 608691721 is about 24671.6785201169. The cubic root of 608691721 is about 847.4858679115.

The spelling of 608691721 in words is "six hundred eight million, six hundred ninety-one thousand, seven hundred twenty-one".