2851491 has 4 divisors (see below), whose sum is σ = 3801992. Its totient is φ = 1900992.

The previous prime is 2851481. The next prime is 2851523. The reversal of 2851491 is 1941582.

It is a happy number.

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

It is not a de Polignac number, because 2851491 - 2⁹ = 2850979 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2851421) 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, 475246 + ... + 475251.

It is an arithmetic number, because the mean of its divisors is an integer number (950498).

2^2851491 is an apocalyptic number.

2851491 is a deficient number, since it is larger than the sum of its proper divisors (950501).

2851491 is an equidigital number, since it uses as much as digits as its factorization.

2851491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950500.

The product of its digits is 2880, while the sum is 30.

The square root of 2851491 is about 1688.6358399608. The cubic root of 2851491 is about 141.8047140325.

Subtracting from 2851491 its reverse (1941582), we obtain a palindrome (909909).

The spelling of 2851491 in words is "two million, eight hundred fifty-one thousand, four hundred ninety-one".