2194128457 has 4 divisors (see below), whose sum is σ = 2216748436. Its totient is φ = 2171508480.

The previous prime is 2194128451. The next prime is 2194128467. The reversal of 2194128457 is 7548214912.

2194128457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 778186816 + 1415941641 = 27896^2 + 37629^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194128457 - 2¹¹ = 2194126409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2194128451) 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, 11309844 + ... + 11310037.

It is an arithmetic number, because the mean of its divisors is an integer number (554187109).

Almost surely, 2^2194128457 is an apocalyptic number.

It is an amenable number.

2194128457 is a deficient number, since it is larger than the sum of its proper divisors (22619979).

2194128457 is an equidigital number, since it uses as much as digits as its factorization.

2194128457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22619978.

The product of its digits is 161280, while the sum is 43.

The square root of 2194128457 is about 46841.5249218042. The cubic root of 2194128457 is about 1299.4333737726.

The spelling of 2194128457 in words is "two billion, one hundred ninety-four million, one hundred twenty-eight thousand, four hundred fifty-seven".