91669493 has 4 divisors (see below), whose sum is σ = 94830540. Its totient is φ = 88508448.

The previous prime is 91669483. The next prime is 91669499. The reversal of 91669493 is 39496619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39496619 = 127 ⋅310997.

It can be written as a sum of positive squares in 2 ways, for example, as 22829284 + 68840209 = 4778^2 + 8297^2 .

It is a cyclic number.

It is not a de Polignac number, because 91669493 - 2¹⁰ = 91668469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91669499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580480 + ... + 1580537.

It is an arithmetic number, because the mean of its divisors is an integer number (23707635).

Almost surely, 2^91669493 is an apocalyptic number.

It is an amenable number.

91669493 is a deficient number, since it is larger than the sum of its proper divisors (3161047).

91669493 is a wasteful number, since it uses less digits than its factorization.

91669493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161046.

The product of its digits is 314928, while the sum is 47.

The square root of 91669493 is about 9574.4186768702. The cubic root of 91669493 is about 450.8945055064.

The spelling of 91669493 in words is "ninety-one million, six hundred sixty-nine thousand, four hundred ninety-three".