91784061 has 12 divisors (see below), whose sum is σ = 132767388. Its totient is φ = 61101504.

The previous prime is 91784057. The next prime is 91784081. The reversal of 91784061 is 16048719.

It can be written as a sum of positive squares in 2 ways, for example, as 78322500 + 13461561 = 8850^2 + 3669^2 .

It is not a de Polignac number, because 91784061 - 2² = 91784057 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91784081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (11063949).

Almost surely, 2^91784061 is an apocalyptic number.

It is an amenable number.

91784061 is a deficient number, since it is larger than the sum of its proper divisors (40983327).

91784061 is a wasteful number, since it uses less digits than its factorization.

91784061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14652 (or 14649 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91784061 is about 9580.3998350800. The cubic root of 91784061 is about 451.0822690843.

The spelling of 91784061 in words is "ninety-one million, seven hundred eighty-four thousand, sixty-one".