91383905 has 8 divisors (see below), whose sum is σ = 109977000. Its totient is φ = 72896256.

The previous prime is 91383893. The next prime is 91383923. The reversal of 91383905 is 50938319.

It can be written as a sum of positive squares in 4 ways, for example, as 25563136 + 65820769 = 5056^2 + 8113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91383905 - 2²² = 87189601 is a prime.

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, 24440 + ... + 27929.

It is an arithmetic number, because the mean of its divisors is an integer number (13747125).

Almost surely, 2^91383905 is an apocalyptic number.

It is an amenable number.

91383905 is a deficient number, since it is larger than the sum of its proper divisors (18593095).

91383905 is a wasteful number, since it uses less digits than its factorization.

91383905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52723.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 91383905 is about 9559.4929258826. The cubic root of 91383905 is about 450.4257780830.

The spelling of 91383905 in words is "ninety-one million, three hundred eighty-three thousand, nine hundred five".