2185628551 has 4 divisors (see below), whose sum is σ = 2186449504. Its totient is φ = 2184807600.

The previous prime is 2185628537. The next prime is 2185628563. The reversal of 2185628551 is 1558265812.

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

It is a cyclic number.

It is not a de Polignac number, because 2185628551 - 2¹⁹ = 2185104263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2185628498 and 2185628507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185628531) 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, 406470 + ... + 411811.

It is an arithmetic number, because the mean of its divisors is an integer number (546612376).

Almost surely, 2^2185628551 is an apocalyptic number.

2185628551 is a deficient number, since it is larger than the sum of its proper divisors (820953).

2185628551 is an equidigital number, since it uses as much as digits as its factorization.

2185628551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820952.

The product of its digits is 192000, while the sum is 43.

The square root of 2185628551 is about 46750.7064224702. The cubic root of 2185628551 is about 1297.7532298293.

The spelling of 2185628551 in words is "two billion, one hundred eighty-five million, six hundred twenty-eight thousand, five hundred fifty-one".