91939105 has 4 divisors (see below), whose sum is σ = 110326932. Its totient is φ = 73551280.

The previous prime is 91939103. The next prime is 91939123. The reversal of 91939105 is 50193919.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14569489 + 77369616 = 3817^2 + 8796^2 .

It is not a de Polignac number, because 91939105 - 2¹ = 91939103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91939103) 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 3 ways as a sum of consecutive naturals, for example, 9193906 + ... + 9193915.

It is an arithmetic number, because the mean of its divisors is an integer number (27581733).

Almost surely, 2^91939105 is an apocalyptic number.

It is an amenable number.

91939105 is a deficient number, since it is larger than the sum of its proper divisors (18387827).

91939105 is a wasteful number, since it uses less digits than its factorization.

91939105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18387826.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 91939105 is about 9588.4881498597. The cubic root of 91939105 is about 451.3361194637.

The spelling of 91939105 in words is "ninety-one million, nine hundred thirty-nine thousand, one hundred five".