91126138537 has 12 divisors (see below), whose sum is σ = 106011244800. Its totient is φ = 78102688776.

The previous prime is 91126138487. The next prime is 91126138553. The reversal of 91126138537 is 73583162119.

It is a happy number.

It is not a de Polignac number, because 91126138537 - 2⁷ = 91126138409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91126138577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 751464 + ... + 864262.

It is an arithmetic number, because the mean of its divisors is an integer number (8834270400).

Almost surely, 2^91126138537 is an apocalyptic number.

It is an amenable number.

91126138537 is a deficient number, since it is larger than the sum of its proper divisors (14885106263).

91126138537 is a wasteful number, since it uses less digits than its factorization.

91126138537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129300 (or 129293 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The spelling of 91126138537 in words is "ninety-one billion, one hundred twenty-six million, one hundred thirty-eight thousand, five hundred thirty-seven".