2278125217 has 4 divisors (see below), whose sum is σ = 2278272276. Its totient is φ = 2277978160.

The previous prime is 2278125211. The next prime is 2278125221. The reversal of 2278125217 is 7125218722.

2278125217 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, and also an emirpimes, since its reverse is a distinct semiprime: 7125218722 = 2 ⋅3562609361.

It can be written as a sum of positive squares in 2 ways, for example, as 145902241 + 2132222976 = 12079^2 + 46176^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278125217 - 2¹⁵ = 2278092449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278125211) 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, 47134 + ... + 82327.

It is an arithmetic number, because the mean of its divisors is an integer number (569568069).

Almost surely, 2^2278125217 is an apocalyptic number.

It is an amenable number.

2278125217 is a deficient number, since it is larger than the sum of its proper divisors (147059).

2278125217 is a wasteful number, since it uses less digits than its factorization.

2278125217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147058.

The product of its digits is 31360, while the sum is 37.

The square root of 2278125217 is about 47729.7100033093. The cubic root of 2278125217 is about 1315.8080239743.

The spelling of 2278125217 in words is "two billion, two hundred seventy-eight million, one hundred twenty-five thousand, two hundred seventeen".