91691851 has 8 divisors (see below), whose sum is σ = 92494080. Its totient is φ = 90892968.

The previous prime is 91691839. The next prime is 91691861. The reversal of 91691851 is 15819619.

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 91691851 - 2⁹ = 91691339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91691801) 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, 102930 + ... + 103816.

It is an arithmetic number, because the mean of its divisors is an integer number (11561760).

Almost surely, 2^91691851 is an apocalyptic number.

91691851 is a deficient number, since it is larger than the sum of its proper divisors (802229).

91691851 is a wasteful number, since it uses less digits than its factorization.

91691851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its digits is 19440, while the sum is 40.

The square root of 91691851 is about 9575.5861961553. The cubic root of 91691851 is about 450.9311599394.

The spelling of 91691851 in words is "ninety-one million, six hundred ninety-one thousand, eight hundred fifty-one".