659147991 has 4 divisors (see below), whose sum is σ = 878863992. Its totient is φ = 439431992.

The previous prime is 659147971. The next prime is 659148001. The reversal of 659147991 is 199741956.

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 659147991 - 2⁹ = 659147479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659147971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109857996 + ... + 109858001.

It is an arithmetic number, because the mean of its divisors is an integer number (219715998).

Almost surely, 2^659147991 is an apocalyptic number.

659147991 is a deficient number, since it is larger than the sum of its proper divisors (219716001).

659147991 is a wasteful number, since it uses less digits than its factorization.

659147991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219716000.

The product of its digits is 612360, while the sum is 51.

The square root of 659147991 is about 25673.8775996147. The cubic root of 659147991 is about 870.2839567222.

The spelling of 659147991 in words is "six hundred fifty-nine million, one hundred forty-seven thousand, nine hundred ninety-one".