91827994897 has 12 divisors (see below), whose sum is σ = 96929766516. Its totient is φ = 86982063840.

The previous prime is 91827994879. The next prime is 91827994901. The reversal of 91827994897 is 79849972819.

It can be written as a sum of positive squares in 2 ways, for example, as 58308243841 + 33519751056 = 241471^2 + 183084^2 .

It is not a de Polignac number, because 91827994897 - 2¹¹ = 91827992849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91827994807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3169963 + ... + 3198799.

It is an arithmetic number, because the mean of its divisors is an integer number (8077480543).

Almost surely, 2^91827994897 is an apocalyptic number.

It is an amenable number.

91827994897 is a deficient number, since it is larger than the sum of its proper divisors (5101771619).

91827994897 is a wasteful number, since it uses less digits than its factorization.

91827994897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37696 (or 37677 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 73.

It can be divided in two parts, 918279 and 94897, that added together give a triangular number (1013176 = T₁₄₂₃).

The spelling of 91827994897 in words is "ninety-one billion, eight hundred twenty-seven million, nine hundred ninety-four thousand, eight hundred ninety-seven".