91498385169 has 9 divisors (see below), whose sum is σ = 132165644923. Its totient is φ = 60998318472.

The previous prime is 91498385161. The next prime is 91498385183. The reversal of 91498385169 is 96158389419.

The square root of 91498385169 is 302487.

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

91498385169 is a `hidden beast` number, since 9 + 1 + 4 + 98 + 385 + 169 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3325021569 + 88173363600 = 57663^2 + 296940^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 91498385169 - 2³ = 91498385161 is a prime.

It is a super-2 number, since 2×91498385169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91498385161) 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 8 ways as a sum of consecutive naturals, for example, 857047 + ... + 957875.

Almost surely, 2^91498385169 is an apocalyptic number.

91498385169 is the 302487-th square number.

91498385169 is the 151244-th centered octagonal number.

It is an amenable number.

91498385169 is a deficient number, since it is larger than the sum of its proper divisors (40667259754).

91498385169 is an frugal number, since it uses more digits than its factorization.

91498385169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201664 (or 100832 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 91498385169 in words is "ninety-one billion, four hundred ninety-eight million, three hundred eighty-five thousand, one hundred sixty-nine".