7256541891 has 4 divisors (see below), whose sum is σ = 9675389192. Its totient is φ = 4837694592.

The previous prime is 7256541863. The next prime is 7256541899. The reversal of 7256541891 is 1981456527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1981456527 = 3 ⋅660485509.

It is not a de Polignac number, because 7256541891 - 2⁹ = 7256541379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7256541891.

It is not an unprimeable number, because it can be changed into a prime (7256541899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1209423646 + ... + 1209423651.

It is an arithmetic number, because the mean of its divisors is an integer number (2418847298).

Almost surely, 2^7256541891 is an apocalyptic number.

7256541891 is a deficient number, since it is larger than the sum of its proper divisors (2418847301).

7256541891 is a wasteful number, since it uses less digits than its factorization.

7256541891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418847300.

The product of its digits is 604800, while the sum is 48.

The square root of 7256541891 is about 85185.3384744112. The cubic root of 7256541891 is about 1936.0202798622.

The spelling of 7256541891 in words is "seven billion, two hundred fifty-six million, five hundred forty-one thousand, eight hundred ninety-one".