90108191 has 8 divisors (see below), whose sum is σ = 93324000. Its totient is φ = 86899680.

The previous prime is 90108173. The next prime is 90108199. The reversal of 90108191 is 19180109.

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-90108191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90108199) 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 7 ways as a sum of consecutive naturals, for example, 39461 + ... + 41681.

It is an arithmetic number, because the mean of its divisors is an integer number (11665500).

Almost surely, 2^90108191 is an apocalyptic number.

90108191 is a deficient number, since it is larger than the sum of its proper divisors (3215809).

90108191 is a wasteful number, since it uses less digits than its factorization.

90108191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 90108191 is about 9492.5334342313. The cubic root of 90108191 is about 448.3199759552.

The spelling of 90108191 in words is "ninety million, one hundred eight thousand, one hundred ninety-one".