91399997041 has 4 divisors (see below), whose sum is σ = 91661888500. Its totient is φ = 91138105584.

The previous prime is 91399997023. The next prime is 91399997057. The reversal of 91399997041 is 14079999319.

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 74049838641 + 17350158400 = 272121^2 + 131720^2 .

It is a cyclic number.

It is not a de Polignac number, because 91399997041 - 2⁵ = 91399997009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91399992041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130945206 + ... + 130945903.

It is an arithmetic number, because the mean of its divisors is an integer number (22915472125).

Almost surely, 2^91399997041 is an apocalyptic number.

It is an amenable number.

91399997041 is a deficient number, since it is larger than the sum of its proper divisors (261891459).

91399997041 is a wasteful number, since it uses less digits than its factorization.

91399997041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261891458.

The product of its (nonzero) digits is 4960116, while the sum is 61.

The spelling of 91399997041 in words is "ninety-one billion, three hundred ninety-nine million, nine hundred ninety-seven thousand, forty-one".