91148065537 has 4 divisors (see below), whose sum is σ = 91954685700. Its totient is φ = 90341445376.

The previous prime is 91148065531. The next prime is 91148065583. The reversal of 91148065537 is 73556084119.

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 12769904016 + 78378161521 = 113004^2 + 279961^2 .

It is a cyclic number.

It is not a de Polignac number, because 91148065537 - 2³ = 91148065529 is a prime.

It is a super-2 number, since 2×91148065537² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91148065531) 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, 403309912 + ... + 403310137.

It is an arithmetic number, because the mean of its divisors is an integer number (22988671425).

Almost surely, 2^91148065537 is an apocalyptic number.

It is an amenable number.

91148065537 is a deficient number, since it is larger than the sum of its proper divisors (806620163).

91148065537 is a wasteful number, since it uses less digits than its factorization.

91148065537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806620162.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 91148065537 in words is "ninety-one billion, one hundred forty-eight million, sixty-five thousand, five hundred thirty-seven".