91991948 has 12 divisors (see below), whose sum is σ = 161275800. Its totient is φ = 45913152.

The previous prime is 91991923. The next prime is 91991951. The reversal of 91991948 is 84919919.

It is a junction number, because it is equal to n+sod(n) for n = 91991896 and 91991905.

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 3 ways as a sum of consecutive naturals, for example, 18173 + ... + 22676.

It is an arithmetic number, because the mean of its divisors is an integer number (13439650).

Almost surely, 2^91991948 is an apocalyptic number.

It is an amenable number.

91991948 is a deficient number, since it is larger than the sum of its proper divisors (69283852).

91991948 is a wasteful number, since it uses less digits than its factorization.

91991948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41416 (or 41414 counting only the distinct ones).

The product of its digits is 209952, while the sum is 50.

The square root of 91991948 is about 9591.2432979255. The cubic root of 91991948 is about 451.4225730160.

The spelling of 91991948 in words is "ninety-one million, nine hundred ninety-one thousand, nine hundred forty-eight".