91961687 has 8 divisors (see below), whose sum is σ = 100003536. Its totient is φ = 84212352.

The previous prime is 91961669. The next prime is 91961711. The reversal of 91961687 is 78616919.

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 91961687 - 2⁸ = 91961431 is a prime.

It is a super-3 number, since 3×91961687³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91961087) 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 7 ways as a sum of consecutive naturals, for example, 72473 + ... + 73730.

It is an arithmetic number, because the mean of its divisors is an integer number (12500442).

Almost surely, 2^91961687 is an apocalyptic number.

91961687 is a deficient number, since it is larger than the sum of its proper divisors (8041849).

91961687 is a wasteful number, since it uses less digits than its factorization.

91961687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146257.

The product of its digits is 163296, while the sum is 47.

The square root of 91961687 is about 9589.6656354640. The cubic root of 91961687 is about 451.3730686955.

The spelling of 91961687 in words is "ninety-one million, nine hundred sixty-one thousand, six hundred eighty-seven".