2198015689 has 9 divisors (see below), whose sum is σ = 2218982439. Its totient is φ = 2177246520.

The previous prime is 2198015671. The next prime is 2198015719. The reversal of 2198015689 is 9865108912.

The square root of 2198015689 is 46883.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1999431225 + 198584464 = 44715^2 + 14092^2 .

It is not a de Polignac number, because 2198015689 - 2⁹ = 2198015177 is a prime.

It is a super-4 number, since 4×2198015689⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2198015609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8110624 + ... + 8110894.

Almost surely, 2^2198015689 is an apocalyptic number.

2198015689 is the 46883-rd square number.

2198015689 is the 23442-nd centered octagonal number.

It is an amenable number.

2198015689 is a deficient number, since it is larger than the sum of its proper divisors (20966750).

2198015689 is an frugal number, since it uses more digits than its factorization.

2198015689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 49.

The cubic root of 2198015689 is about 1300.2003022722.

Multiplying 2198015689 by its sum of digits (49), we get a square (107702768761 = 328181²).

The spelling of 2198015689 in words is "two billion, one hundred ninety-eight million, fifteen thousand, six hundred eighty-nine".