91357641 has 6 divisors (see below), whose sum is σ = 131961050. Its totient is φ = 60905088.

The previous prime is 91357639. The next prime is 91357657. The reversal of 91357641 is 14675319.

91357641 is a `hidden beast` number, since 9 + 1 + 3 + 5 + 7 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88454025 + 2903616 = 9405^2 + 1704^2 .

It is not a de Polignac number, because 91357641 - 2¹ = 91357639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91357596 and 91357605.

It is not an unprimeable number, because it can be changed into a prime (91357621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5075416 + ... + 5075433.

Almost surely, 2^91357641 is an apocalyptic number.

It is an amenable number.

91357641 is a deficient number, since it is larger than the sum of its proper divisors (40603409).

91357641 is a wasteful number, since it uses less digits than its factorization.

91357641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150855 (or 10150852 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 91357641 is about 9558.1191141354. The cubic root of 91357641 is about 450.3826227223.

The spelling of 91357641 in words is "ninety-one million, three hundred fifty-seven thousand, six hundred forty-one".