2251128686 has 4 divisors (see below), whose sum is σ = 3376693032. Its totient is φ = 1125564342.

The previous prime is 2251128673. The next prime is 2251128697. The reversal of 2251128686 is 6868211522.

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: 6868211522 = 2 ⋅3434105761.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 562782170 + ... + 562782173.

It is an arithmetic number, because the mean of its divisors is an integer number (844173258).

Almost surely, 2^2251128686 is an apocalyptic number.

2251128686 is a deficient number, since it is larger than the sum of its proper divisors (1125564346).

2251128686 is a wasteful number, since it uses less digits than its factorization.

2251128686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125564345.

The product of its digits is 92160, while the sum is 41.

The square root of 2251128686 is about 47446.0608059299. The cubic root of 2251128686 is about 1310.5897711522.

The spelling of 2251128686 in words is "two billion, two hundred fifty-one million, one hundred twenty-eight thousand, six hundred eighty-six".