91049481 has 32 divisors (see below), whose sum is σ = 138938880. Its totient is φ = 58900608.

The previous prime is 91049461. The next prime is 91049507. The reversal of 91049481 is 18494019.

91049481 is a `hidden beast` number, since 91 + 0 + 494 + 81 = 666.

It is not a de Polignac number, because 91049481 - 2⁷ = 91049353 is a prime.

It is a super-2 number, since 2×91049481² = 16580015980738722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91049401) 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 31 ways as a sum of consecutive naturals, for example, 199005 + ... + 199461.

It is an arithmetic number, because the mean of its divisors is an integer number (4341840).

Almost surely, 2^91049481 is an apocalyptic number.

It is an amenable number.

91049481 is a deficient number, since it is larger than the sum of its proper divisors (47889399).

91049481 is a wasteful number, since it uses less digits than its factorization.

91049481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91049481 is about 9541.9851708122. The cubic root of 91049481 is about 449.8756545325.

It can be divided in two parts, 910494 and 81, that added together give a triangular number (910575 = T₁₃₄₉).

The spelling of 91049481 in words is "ninety-one million, forty-nine thousand, four hundred eighty-one".