91851 has 8 divisors (see below), whose sum is σ = 129744. Its totient is φ = 57600.

The previous prime is 91841. The next prime is 91867. The reversal of 91851 is 15819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91851 - 2¹⁵ = 59083 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91851.

It is not an unprimeable number, because it can be changed into a prime (91801) 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, 850 + ... + 951.

It is an arithmetic number, because the mean of its divisors is an integer number (16218).

2⁹¹⁸⁵¹ is an apocalyptic number.

91851 is a deficient number, since it is larger than the sum of its proper divisors (37893).

91851 is a wasteful number, since it uses less digits than its factorization.

91851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

The product of its digits is 360, while the sum is 24.

The square root of 91851 is about 303.0692990060. The cubic root of 91851 is about 45.1191901985.

It can be divided in two parts, 918 and 51, that added together give a palindrome (969).

The spelling of 91851 in words is "ninety-one thousand, eight hundred fifty-one".