2608221991 has 8 divisors (see below), whose sum is σ = 2800544544. Its totient is φ = 2420221440.

The previous prime is 2608221977. The next prime is 2608222007. The reversal of 2608221991 is 1991228062.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2608221991 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 (2608221911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079250 + ... + 1081663.

It is an arithmetic number, because the mean of its divisors is an integer number (350068068).

Almost surely, 2^2608221991 is an apocalyptic number.

2608221991 is a deficient number, since it is larger than the sum of its proper divisors (192322553).

2608221991 is a wasteful number, since it uses less digits than its factorization.

2608221991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161001.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 2608221991 is about 51070.7547525979. The cubic root of 2608221991 is about 1376.5168039047.

The spelling of 2608221991 in words is "two billion, six hundred eight million, two hundred twenty-one thousand, nine hundred ninety-one".