91577851 has 4 divisors (see below), whose sum is σ = 91625272. Its totient is φ = 91530432.

The previous prime is 91577839. The next prime is 91577867. The reversal of 91577851 is 15877519.

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 91577851 - 2⁵ = 91577819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91577798 and 91577807.

It is not an unprimeable number, because it can be changed into a prime (91572851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20685 + ... + 24718.

It is an arithmetic number, because the mean of its divisors is an integer number (22906318).

Almost surely, 2^91577851 is an apocalyptic number.

91577851 is a deficient number, since it is larger than the sum of its proper divisors (47421).

91577851 is a wasteful number, since it uses less digits than its factorization.

91577851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47420.

The product of its digits is 88200, while the sum is 43.

The square root of 91577851 is about 9569.6317066019. The cubic root of 91577851 is about 450.7442023173.

The spelling of 91577851 in words is "ninety-one million, five hundred seventy-seven thousand, eight hundred fifty-one".