609100991 has 4 divisors (see below), whose sum is σ = 612162000. Its totient is φ = 606039984.

The previous prime is 609100969. The next prime is 609100997. The reversal of 609100991 is 199001906.

609100991 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 609100991 - 2¹⁴ = 609084607 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 (609100997) 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, 1530206 + ... + 1530603.

It is an arithmetic number, because the mean of its divisors is an integer number (153040500).

Almost surely, 2^609100991 is an apocalyptic number.

609100991 is a deficient number, since it is larger than the sum of its proper divisors (3061009).

609100991 is a wasteful number, since it uses less digits than its factorization.

609100991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061008.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 609100991 is about 24679.9714546026. The cubic root of 609100991 is about 847.6757685460.

The spelling of 609100991 in words is "six hundred nine million, one hundred thousand, nine hundred ninety-one".