91513786939 has 16 divisors (see below), whose sum is σ = 93226816800. Its totient is φ = 89811558144.

The previous prime is 91513786927. The next prime is 91513786951. The reversal of 91513786939 is 93968731519.

It is an interprime number because it is at equal distance from previous prime (91513786927) and next prime (91513786951).

It is a cyclic number.

It is not a de Polignac number, because 91513786939 - 2⁷ = 91513786811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91513786909) 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 15 ways as a sum of consecutive naturals, for example, 32029999 + ... + 32032855.

It is an arithmetic number, because the mean of its divisors is an integer number (5826676050).

Almost surely, 2^91513786939 is an apocalyptic number.

91513786939 is a deficient number, since it is larger than the sum of its proper divisors (1713029861).

91513786939 is a wasteful number, since it uses less digits than its factorization.

91513786939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542.

The product of its digits is 11022480, while the sum is 61.

The spelling of 91513786939 in words is "ninety-one billion, five hundred thirteen million, seven hundred eighty-six thousand, nine hundred thirty-nine".