2189181810 has 16 divisors (see below), whose sum is σ = 5254036416. Its totient is φ = 583781808.

The previous prime is 2189181809. The next prime is 2189181811. The reversal of 2189181810 is 181819812.

It is an interprime number because it is at equal distance from previous prime (2189181809) and next prime (2189181811).

It is a super-2 number, since 2×2189181810² = 9585033994469752200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2189181811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36486334 + ... + 36486393.

It is an arithmetic number, because the mean of its divisors is an integer number (328377276).

Almost surely, 2^2189181810 is an apocalyptic number.

2189181810 is an abundant number, since it is smaller than the sum of its proper divisors (3064854606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2189181810 is a wasteful number, since it uses less digits than its factorization.

2189181810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72972737.

The product of its (nonzero) digits is 9216, while the sum is 39.

The square root of 2189181810 is about 46788.6931854268. The cubic root of 2189181810 is about 1298.4561178993.

The spelling of 2189181810 in words is "two billion, one hundred eighty-nine million, one hundred eighty-one thousand, eight hundred ten".