91315169856 has 147 divisors (see below), whose sum is σ = 271875363411. Its totient is φ = 30416632704.

The previous prime is 91315169839. The next prime is 91315169899. The reversal of 91315169856 is 65896151319.

The square root of 91315169856 is 302184.

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

91315169856 is a `hidden beast` number, since 9 + 1 + 31 + 516 + 98 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 65271045 + ... + 65272443.

Almost surely, 2^91315169856 is an apocalyptic number.

91315169856 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

91315169856 is the 302184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91315169856

91315169856 is an abundant number, since it is smaller than the sum of its proper divisors (180560193555).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91315169856 is an frugal number, since it uses more digits than its factorization.

91315169856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828 (or 1404 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The spelling of 91315169856 in words is "ninety-one billion, three hundred fifteen million, one hundred sixty-nine thousand, eight hundred fifty-six".