8491851 has 8 divisors (see below), whose sum is σ = 12580560. Its totient is φ = 5661216.

The previous prime is 8491831. The next prime is 8491897. The reversal of 8491851 is 1581948.

It is not a de Polignac number, because 8491851 - 2⁷ = 8491723 is a prime.

It is a super-2 number, since 2×8491851² = 144223066812402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8491801) 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, 157230 + ... + 157283.

It is an arithmetic number, because the mean of its divisors is an integer number (1572570).

Almost surely, 2^8491851 is an apocalyptic number.

8491851 is a deficient number, since it is larger than the sum of its proper divisors (4088709).

8491851 is a wasteful number, since it uses less digits than its factorization.

8491851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314522 (or 314516 counting only the distinct ones).

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

The square root of 8491851 is about 2914.0780703337. The cubic root of 8491851 is about 204.0175157971.

Subtracting from 8491851 its reverse (1581948), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 8491851 in words is "eight million, four hundred ninety-one thousand, eight hundred fifty-one".