91771438 has 8 divisors (see below), whose sum is σ = 150171480. Its totient is φ = 41714280.

The previous prime is 91771369. The next prime is 91771447. The reversal of 91771438 is 83417719.

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

It is a self number, because there is not a number n which added to its sum of digits gives 91771438.

It is a congruent number.

It is an unprimeable number.

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, 2085693 + ... + 2085736.

It is an arithmetic number, because the mean of its divisors is an integer number (18771435).

Almost surely, 2^91771438 is an apocalyptic number.

91771438 is a deficient number, since it is larger than the sum of its proper divisors (58400042).

91771438 is a wasteful number, since it uses less digits than its factorization.

91771438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171442.

The product of its digits is 42336, while the sum is 40.

The square root of 91771438 is about 9579.7410194639. The cubic root of 91771438 is about 451.0615891229.

The spelling of 91771438 in words is "ninety-one million, seven hundred seventy-one thousand, four hundred thirty-eight".