91098001 has 4 divisors (see below), whose sum is σ = 91904292. Its totient is φ = 90291712.

The previous prime is 91097987. The next prime is 91098031. The reversal of 91098001 is 10089019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24512401 + 66585600 = 4951^2 + 8160^2 .

It is a cyclic number.

It is not a de Polignac number, because 91098001 - 2⁵ = 91097969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91098031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402976 + ... + 403201.

It is an arithmetic number, because the mean of its divisors is an integer number (22976073).

Almost surely, 2^91098001 is an apocalyptic number.

It is an amenable number.

91098001 is a deficient number, since it is larger than the sum of its proper divisors (806291).

91098001 is a wasteful number, since it uses less digits than its factorization.

91098001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806290.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 91098001 is about 9544.5272800700. The cubic root of 91098001 is about 449.9555528117.

The spelling of 91098001 in words is "ninety-one million, ninety-eight thousand, one".