8491031 has 4 divisors (see below), whose sum is σ = 8545272. Its totient is φ = 8436792.

The previous prime is 8491001. The next prime is 8491033. The reversal of 8491031 is 1301948.

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-8491031 is a prime.

It is a super-2 number, since 2×8491031² = 144195214885922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491033) 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, 26885 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (2136318).

Almost surely, 2^8491031 is an apocalyptic number.

8491031 is a deficient number, since it is larger than the sum of its proper divisors (54241).

8491031 is a wasteful number, since it uses less digits than its factorization.

8491031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54240.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 8491031 is about 2913.9373706379. The cubic root of 8491031 is about 204.0109487267.

Adding to 8491031 its reverse (1301948), we get a palindrome (9792979).

The spelling of 8491031 in words is "eight million, four hundred ninety-one thousand, thirty-one".