91139798 has 16 divisors (see below), whose sum is σ = 138756240. Its totient is φ = 44893056.

The previous prime is 91139773. The next prime is 91139801. The reversal of 91139798 is 89793119.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 36890 + ... + 39282.

It is an arithmetic number, because the mean of its divisors is an integer number (8672265).

Almost surely, 2^91139798 is an apocalyptic number.

91139798 is a deficient number, since it is larger than the sum of its proper divisors (47616442).

91139798 is a wasteful number, since it uses less digits than its factorization.

91139798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671.

The product of its digits is 122472, while the sum is 47.

The square root of 91139798 is about 9546.7166083424. The cubic root of 91139798 is about 450.0243575293.

The spelling of 91139798 in words is "ninety-one million, one hundred thirty-nine thousand, seven hundred ninety-eight".