2189215971 has 8 divisors (see below), whose sum is σ = 3243282960. Its totient is φ = 1459477296.
The previous prime is 2189215949. The next prime is 2189216017. The reversal of 2189215971 is 1795129812.
It is not a de Polignac number, because 2189215971 - 217 = 2189084899 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2189215271) 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, 40541010 + ... + 40541063.
It is an arithmetic number, because the mean of its divisors is an integer number (405410370).
Almost surely, 22189215971 is an apocalyptic number.
2189215971 is a deficient number, since it is larger than the sum of its proper divisors (1054066989).
2189215971 is an equidigital number, since it uses as much as digits as its factorization.
2189215971 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 81082082 (or 81082076 counting only the distinct ones).
The product of its digits is 90720, while the sum is 45.
The square root of 2189215971 is about 46789.0582401484. The cubic root of 2189215971 is about 1298.4628717663.
The spelling of 2189215971 in words is "two billion, one hundred eighty-nine million, two hundred fifteen thousand, nine hundred seventy-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.063 sec. • engine limits •