606999991 has 4 divisors (see below), whose sum is σ = 653692312. Its totient is φ = 560307672.

The previous prime is 606999983. The next prime is 607000003. The reversal of 606999991 is 199999606.

It is a happy number.

606999991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 606999991 - 2³ = 606999983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (606999901) 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, 23346141 + ... + 23346166.

It is an arithmetic number, because the mean of its divisors is an integer number (163423078).

Almost surely, 2^606999991 is an apocalyptic number.

606999991 is a deficient number, since it is larger than the sum of its proper divisors (46692321).

606999991 is a wasteful number, since it uses less digits than its factorization.

606999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46692320.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 606999991 is about 24637.3698068605. The cubic root of 606999991 is about 846.7000034579.

The spelling of 606999991 in words is "six hundred six million, nine hundred ninety-nine thousand, nine hundred ninety-one".