91887859580213 has 8 divisors (see below), whose sum is σ = 92751040011960. Its totient is φ = 91025045922240.

The previous prime is 91887859580177. The next prime is 91887859580221. The reversal of 91887859580213 is 31208595878819.

It can be written as a sum of positive squares in 4 ways, for example, as 88504465009 + 91799355115204 = 297497^2 + 9581198^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91887859580213 - 2¹⁸ = 91887859318069 is a prime.

It is a super-3 number, since 3×91887859580213³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91887859580243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91190018 + ... + 92192163.

It is an arithmetic number, because the mean of its divisors is an integer number (11593880001495).

Almost surely, 2^{91887859580213} is an apocalyptic number.

It is an amenable number.

91887859580213 is a deficient number, since it is larger than the sum of its proper divisors (863180431747).

91887859580213 is a wasteful number, since it uses less digits than its factorization.

91887859580213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183386887.

The product of its (nonzero) digits is 348364800, while the sum is 74.

The spelling of 91887859580213 in words is "ninety-one trillion, eight hundred eighty-seven billion, eight hundred fifty-nine million, five hundred eighty thousand, two hundred thirteen".