91117040 has 40 divisors (see below), whose sum is σ = 242112480. Its totient is φ = 31239936.

The previous prime is 91117001. The next prime is 91117073. The reversal of 91117040 is 4071119.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 91116997 and 91117015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80795 + ... + 81914.

It is an arithmetic number, because the mean of its divisors is an integer number (6052812).

Almost surely, 2^91117040 is an apocalyptic number.

It is an amenable number.

91117040 is an abundant number, since it is smaller than the sum of its proper divisors (150995440).

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

91117040 is a wasteful number, since it uses less digits than its factorization.

91117040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162729 (or 162723 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 91117040 is about 9545.5246058035. The cubic root of 91117040 is about 449.9868967378.

Adding to 91117040 its reverse (4071119), we get a palindrome (95188159).

The spelling of 91117040 in words is "ninety-one million, one hundred seventeen thousand, forty".