93490208521 has 4 divisors (see below), whose sum is σ = 93516232212. Its totient is φ = 93464184832.

The previous prime is 93490208503. The next prime is 93490208593. The reversal of 93490208521 is 12580209439.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12580209439 = 7 ⋅1797172777.

It can be written as a sum of positive squares in 2 ways, for example, as 25611201225 + 67879007296 = 160035^2 + 260536^2 .

It is a cyclic number.

It is not a de Polignac number, because 93490208521 - 2¹⁷ = 93490077449 is a prime.

It is a super-2 number, since 2×93490208521² (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 (93490208501) 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 3 ways as a sum of consecutive naturals, for example, 13006456 + ... + 13013641.

It is an arithmetic number, because the mean of its divisors is an integer number (23379058053).

Almost surely, 2^93490208521 is an apocalyptic number.

It is an amenable number.

93490208521 is a deficient number, since it is larger than the sum of its proper divisors (26023691).

93490208521 is a wasteful number, since it uses less digits than its factorization.

93490208521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26023690.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 93490208521 in words is "ninety-three billion, four hundred ninety million, two hundred eight thousand, five hundred twenty-one".