91685103631 has 4 divisors (see below), whose sum is σ = 100020113064. Its totient is φ = 83350094200.

The previous prime is 91685103583. The next prime is 91685103677. The reversal of 91685103631 is 13630158619.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91685103631 - 2¹⁵ = 91685070863 is a prime.

It is a super-5 number, since 5×91685103631⁵ (a number of 56 digits) contains 55555 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 (91685103131) 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, 4167504700 + ... + 4167504721.

It is an arithmetic number, because the mean of its divisors is an integer number (25005028266).

Almost surely, 2^91685103631 is an apocalyptic number.

91685103631 is a deficient number, since it is larger than the sum of its proper divisors (8335009433).

91685103631 is a wasteful number, since it uses less digits than its factorization.

91685103631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335009432.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 91685103631 in words is "ninety-one billion, six hundred eighty-five million, one hundred three thousand, six hundred thirty-one".