91520948737 has 16 divisors (see below), whose sum is σ = 93288672000. Its totient is φ = 89767444480.

The previous prime is 91520948699. The next prime is 91520948747. The reversal of 91520948737 is 73784902519.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91520948737 - 2⁷ = 91520948609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91520948747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16948764 + ... + 16954162.

It is an arithmetic number, because the mean of its divisors is an integer number (5830542000).

Almost surely, 2^91520948737 is an apocalyptic number.

It is an amenable number.

91520948737 is a deficient number, since it is larger than the sum of its proper divisors (1767723263).

91520948737 is a wasteful number, since it uses less digits than its factorization.

91520948737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 91520948737 in words is "ninety-one billion, five hundred twenty million, nine hundred forty-eight thousand, seven hundred thirty-seven".