91249806 has 8 divisors (see below), whose sum is σ = 182499624. Its totient is φ = 30416600.

The previous prime is 91249801. The next prime is 91249817. The reversal of 91249806 is 60894219.

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

91249806 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91249801) 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, 7604145 + ... + 7604156.

It is an arithmetic number, because the mean of its divisors is an integer number (22812453).

Almost surely, 2^91249806 is an apocalyptic number.

91249806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91249806 is a wasteful number, since it uses less digits than its factorization.

91249806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15208306.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 91249806 is about 9552.4764328419. The cubic root of 91249806 is about 450.2053482546.

The spelling of 91249806 in words is "ninety-one million, two hundred forty-nine thousand, eight hundred six".