91406687 has 4 divisors (see below), whose sum is σ = 93877176. Its totient is φ = 88936200.

The previous prime is 91406683. The next prime is 91406743. The reversal of 91406687 is 78660419.

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 91406687 - 2² = 91406683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91406683) 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, 1235189 + ... + 1235262.

It is an arithmetic number, because the mean of its divisors is an integer number (23469294).

Almost surely, 2^91406687 is an apocalyptic number.

91406687 is a deficient number, since it is larger than the sum of its proper divisors (2470489).

91406687 is a wasteful number, since it uses less digits than its factorization.

91406687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470488.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 91406687 is about 9560.6844420261. The cubic root of 91406687 is about 450.4632053427.

The spelling of 91406687 in words is "ninety-one million, four hundred six thousand, six hundred eighty-seven".