91949691 has 8 divisors (see below), whose sum is σ = 126827280. Its totient is φ = 59185952.

The previous prime is 91949687. The next prime is 91949707. The reversal of 91949691 is 19694919.

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 91949691 - 2² = 91949687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91949691.

It is not an unprimeable number, because it can be changed into a prime (91949621) 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, 528360 + ... + 528533.

It is an arithmetic number, because the mean of its divisors is an integer number (15853410).

Almost surely, 2^91949691 is an apocalyptic number.

91949691 is a deficient number, since it is larger than the sum of its proper divisors (34877589).

91949691 is a wasteful number, since it uses less digits than its factorization.

91949691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056925.

The product of its digits is 157464, while the sum is 48.

The square root of 91949691 is about 9589.0401500880. The cubic root of 91949691 is about 451.3534412942.

The spelling of 91949691 in words is "ninety-one million, nine hundred forty-nine thousand, six hundred ninety-one".