187225609 has 4 divisors (see below), whose sum is σ = 187370820. Its totient is φ = 187080400.

The previous prime is 187225603. The next prime is 187225637. The reversal of 187225609 is 906522781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906522781 = 6911 ⋅131171.

It can be written as a sum of positive squares in 2 ways, for example, as 18147600 + 169078009 = 4260^2 + 13003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187225609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187225603) 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, 70654 + ... + 73255.

It is an arithmetic number, because the mean of its divisors is an integer number (46842705).

Almost surely, 2^187225609 is an apocalyptic number.

It is an amenable number.

187225609 is a deficient number, since it is larger than the sum of its proper divisors (145211).

187225609 is a wasteful number, since it uses less digits than its factorization.

187225609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145210.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 187225609 is about 13683.0409266362. The cubic root of 187225609 is about 572.0777856056.

The spelling of 187225609 in words is "one hundred eighty-seven million, two hundred twenty-five thousand, six hundred nine".