91341978 has 48 divisors (see below), whose sum is σ = 228866400. Its totient is φ = 24089184.

The previous prime is 91341923. The next prime is 91341983. The reversal of 91341978 is 87914319.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 23 ways as a sum of consecutive naturals, for example, 8128 + ... + 15771.

It is an arithmetic number, because the mean of its divisors is an integer number (4768050).

Almost surely, 2^91341978 is an apocalyptic number.

91341978 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

91341978 is an abundant number, since it is smaller than the sum of its proper divisors (137524422).

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

91341978 is a wasteful number, since it uses less digits than its factorization.

91341978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23931 (or 23924 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 91341978 is about 9557.2997232482. The cubic root of 91341978 is about 450.3568823240.

The spelling of 91341978 in words is "ninety-one million, three hundred forty-one thousand, nine hundred seventy-eight".