91887484953617 has 4 divisors (see below), whose sum is σ = 91889490356916. Its totient is φ = 91885479550320.

The previous prime is 91887484953611. The next prime is 91887484953623. The reversal of 91887484953617 is 71635948478819.

It is a happy number.

It is a Cunningham number, because it is equal to 9585796²+1.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (91887484953611) and next prime (91887484953623).

It can be written as a sum of positive squares in 2 ways, for example, as 91687059512896 + 200425440721 = 9575336^2 + 447689^2 .

It is a cyclic number.

It is not a de Polignac number, because 91887484953617 - 2¹² = 91887484949521 is a prime.

It is a super-2 number, since 2×91887484953617² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91887484953611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002632918 + ... + 1002724559.

It is an arithmetic number, because the mean of its divisors is an integer number (22972372589229).

Almost surely, 2^{91887484953617} is an apocalyptic number.

It is an amenable number.

91887484953617 is a deficient number, since it is larger than the sum of its proper divisors (2005403299).

91887484953617 is a wasteful number, since it uses less digits than its factorization.

91887484953617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005403298.

The product of its digits is 2926264320, while the sum is 80.

The spelling of 91887484953617 in words is "ninety-one trillion, eight hundred eighty-seven billion, four hundred eighty-four million, nine hundred fifty-three thousand, six hundred seventeen".