108649391 has 8 divisors (see below), whose sum is σ = 114885120. Its totient is φ = 102465432.

The previous prime is 108649367. The next prime is 108649393. The reversal of 108649391 is 193946801.

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 108649391 - 2¹⁰ = 108648367 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 (108649393) 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, 8585 + ... + 17058.

It is an arithmetic number, because the mean of its divisors is an integer number (14360640).

Almost surely, 2^108649391 is an apocalyptic number.

108649391 is a deficient number, since it is larger than the sum of its proper divisors (6235729).

108649391 is a wasteful number, since it uses less digits than its factorization.

108649391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25885.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 108649391 is about 10423.5018587805. The cubic root of 108649391 is about 477.1728940324.

The spelling of 108649391 in words is "one hundred eight million, six hundred forty-nine thousand, three hundred ninety-one".