91697529856 has 33 divisors (see below), whose sum is σ = 183324884151. Its totient is φ = 45843919872.

The previous prime is 91697529853. The next prime is 91697529863. The reversal of 91697529856 is 65892579619.

The square root of 91697529856 is 302816.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×91697529856² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91697529791 and 91697529800.

It is not an unprimeable number, because it can be changed into a prime (91697529851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9685381 + ... + 9694843.

Almost surely, 2^91697529856 is an apocalyptic number.

91697529856 is the 302816-th square number.

It is an amenable number.

91697529856 is a deficient number, since it is larger than the sum of its proper divisors (91627354295).

91697529856 is an frugal number, since it uses more digits than its factorization.

91697529856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18946 (or 9465 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 67.

The spelling of 91697529856 in words is "ninety-one billion, six hundred ninety-seven million, five hundred twenty-nine thousand, eight hundred fifty-six".