91877851 has 4 divisors (see below), whose sum is σ = 98945392. Its totient is φ = 84810312.

The previous prime is 91877833. The next prime is 91877857. The reversal of 91877851 is 15877819.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91877851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91877857) 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, 3533751 + ... + 3533776.

It is an arithmetic number, because the mean of its divisors is an integer number (24736348).

Almost surely, 2^91877851 is an apocalyptic number.

91877851 is a deficient number, since it is larger than the sum of its proper divisors (7067541).

91877851 is a wasteful number, since it uses less digits than its factorization.

91877851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067540.

The product of its digits is 141120, while the sum is 46.

The square root of 91877851 is about 9585.2934749021. The cubic root of 91877851 is about 451.2358636671.

The spelling of 91877851 in words is "ninety-one million, eight hundred seventy-seven thousand, eight hundred fifty-one".