91640938241 has 4 divisors (see below), whose sum is σ = 92530656192. Its totient is φ = 90751220292.

The previous prime is 91640938231. The next prime is 91640938289. The reversal of 91640938241 is 14283904619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91640938241 - 2⁶ = 91640938177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91640938201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444858821 + ... + 444859026.

It is an arithmetic number, because the mean of its divisors is an integer number (23132664048).

Almost surely, 2^91640938241 is an apocalyptic number.

It is an amenable number.

91640938241 is a deficient number, since it is larger than the sum of its proper divisors (889717951).

91640938241 is a wasteful number, since it uses less digits than its factorization.

91640938241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889717950.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 91640938241 in words is "ninety-one billion, six hundred forty million, nine hundred thirty-eight thousand, two hundred forty-one".