2491225851 has 4 divisors (see below), whose sum is σ = 3321634472. Its totient is φ = 1660817232.

The previous prime is 2491225837. The next prime is 2491225859. The reversal of 2491225851 is 1585221942.

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

It is not a de Polignac number, because 2491225851 - 2⁵ = 2491225819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2491225859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415204306 + ... + 415204311.

It is an arithmetic number, because the mean of its divisors is an integer number (830408618).

Almost surely, 2^2491225851 is an apocalyptic number.

2491225851 is a deficient number, since it is larger than the sum of its proper divisors (830408621).

2491225851 is an equidigital number, since it uses as much as digits as its factorization.

2491225851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830408620.

The product of its digits is 57600, while the sum is 39.

The square root of 2491225851 is about 49912.1813889155. The cubic root of 2491225851 is about 1355.6191668366.

The spelling of 2491225851 in words is "two billion, four hundred ninety-one million, two hundred twenty-five thousand, eight hundred fifty-one".