2172245447 has 4 divisors (see below), whose sum is σ = 2177717496. Its totient is φ = 2166773400.

The previous prime is 2172245407. The next prime is 2172245461. The reversal of 2172245447 is 7445422712.

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 2172245447 - 2²² = 2168051143 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 2172245447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172245407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2735429 + ... + 2736222.

It is an arithmetic number, because the mean of its divisors is an integer number (544429374).

Almost surely, 2^2172245447 is an apocalyptic number.

2172245447 is a deficient number, since it is larger than the sum of its proper divisors (5472049).

2172245447 is an equidigital number, since it uses as much as digits as its factorization.

2172245447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472048.

The product of its digits is 125440, while the sum is 38.

The square root of 2172245447 is about 46607.3540012732. The cubic root of 2172245447 is about 1295.0989915532.

The spelling of 2172245447 in words is "two billion, one hundred seventy-two million, two hundred forty-five thousand, four hundred forty-seven".