2256947993 has 4 divisors (see below), whose sum is σ = 2257433808. Its totient is φ = 2256462180.

The previous prime is 2256947977. The next prime is 2256948011. The reversal of 2256947993 is 3997496522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2256947993 - 2⁴ = 2256947977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256947293) 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, 235871 + ... + 245252.

It is an arithmetic number, because the mean of its divisors is an integer number (564358452).

Almost surely, 2^2256947993 is an apocalyptic number.

It is an amenable number.

2256947993 is a deficient number, since it is larger than the sum of its proper divisors (485815).

2256947993 is an equidigital number, since it uses as much as digits as its factorization.

2256947993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485814.

The product of its digits is 7348320, while the sum is 56.

The square root of 2256947993 is about 47507.3467265854. The cubic root of 2256947993 is about 1311.7181179895.

The spelling of 2256947993 in words is "two billion, two hundred fifty-six million, nine hundred forty-seven thousand, nine hundred ninety-three".