91771494 has 16 divisors (see below), whose sum is σ = 183859632. Its totient is φ = 30537728.

The previous prime is 91771487. The next prime is 91771499. The reversal of 91771494 is 49417719.

It is a super-2 number, since 2×91771494² = 16844014221984072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91771499) 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 7 ways as a sum of consecutive naturals, for example, 9339 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (11491227).

Almost surely, 2^91771494 is an apocalyptic number.

91771494 is an abundant number, since it is smaller than the sum of its proper divisors (92088138).

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

91771494 is a wasteful number, since it uses less digits than its factorization.

91771494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26391.

The product of its digits is 63504, while the sum is 42.

The square root of 91771494 is about 9579.7439422982. The cubic root of 91771494 is about 451.0616808705.

The spelling of 91771494 in words is "ninety-one million, seven hundred seventy-one thousand, four hundred ninety-four".