91090101 has 8 divisors (see below), whose sum is σ = 122568160. Its totient is φ = 60169392.

The previous prime is 91090099. The next prime is 91090127. The reversal of 91090101 is 10109019.

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

It is not a de Polignac number, because 91090101 - 2¹ = 91090099 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 (91090171) 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, 138955 + ... + 139608.

It is an arithmetic number, because the mean of its divisors is an integer number (15321020).

Almost surely, 2^91090101 is an apocalyptic number.

It is an amenable number.

91090101 is a deficient number, since it is larger than the sum of its proper divisors (31478059).

91090101 is a wasteful number, since it uses less digits than its factorization.

91090101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278675.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 91090101 is about 9544.1134213713. The cubic root of 91090101 is about 449.9425457512.

The spelling of 91090101 in words is "ninety-one million, ninety thousand, one hundred one".