91961686 has 8 divisors (see below), whose sum is σ = 142392384. Its totient is φ = 44497560.

The previous prime is 91961669. The next prime is 91961711. The reversal of 91961686 is 68616919.

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

It is a super-3 number, since 3×91961686³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741565 + ... + 741688.

It is an arithmetic number, because the mean of its divisors is an integer number (17799048).

Almost surely, 2^91961686 is an apocalyptic number.

91961686 is a deficient number, since it is larger than the sum of its proper divisors (50430698).

91961686 is a wasteful number, since it uses less digits than its factorization.

91961686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483286.

The product of its digits is 139968, while the sum is 46.

The square root of 91961686 is about 9589.6655833246. The cubic root of 91961686 is about 451.3730670594.

The spelling of 91961686 in words is "ninety-one million, nine hundred sixty-one thousand, six hundred eighty-six".