2172973609 has 4 divisors (see below), whose sum is σ = 2300795604. Its totient is φ = 2045151616.

The previous prime is 2172973597. The next prime is 2172973619. The reversal of 2172973609 is 9063792712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1590813225 + 582160384 = 39885^2 + 24128^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172973609 - 2²³ = 2164585001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172973619) 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, 63910972 + ... + 63911005.

It is an arithmetic number, because the mean of its divisors is an integer number (575198901).

Almost surely, 2^2172973609 is an apocalyptic number.

It is an amenable number.

2172973609 is a deficient number, since it is larger than the sum of its proper divisors (127821995).

2172973609 is a wasteful number, since it uses less digits than its factorization.

2172973609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127821994.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 2172973609 is about 46615.1650109704. The cubic root of 2172973609 is about 1295.2436861472.

The spelling of 2172973609 in words is "two billion, one hundred seventy-two million, nine hundred seventy-three thousand, six hundred nine".