91840851 has 32 divisors (see below), whose sum is σ = 151660800. Its totient is φ = 54587520.

The previous prime is 91840849. The next prime is 91840871. The reversal of 91840851 is 15804819.

It is not a de Polignac number, because 91840851 - 2¹ = 91840849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91840871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3456 + ... + 13986.

It is an arithmetic number, because the mean of its divisors is an integer number (4739400).

Almost surely, 2^91840851 is an apocalyptic number.

91840851 is a deficient number, since it is larger than the sum of its proper divisors (59819949).

91840851 is a wasteful number, since it uses less digits than its factorization.

91840851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10576 (or 10570 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 91840851 is about 9583.3632405330. The cubic root of 91840851 is about 451.1752833478.

The spelling of 91840851 in words is "ninety-one million, eight hundred forty thousand, eight hundred fifty-one".