209070145 has 8 divisors (see below), whose sum is σ = 252185256. Its totient is φ = 166388736.

The previous prime is 209070143. The next prime is 209070181. The reversal of 209070145 is 541070902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31674384 + 177395761 = 5628^2 + 13319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209070145 - 2¹ = 209070143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209070143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107362 + ... + 109291.

It is an arithmetic number, because the mean of its divisors is an integer number (31523157).

Almost surely, 2^209070145 is an apocalyptic number.

It is an amenable number.

209070145 is a deficient number, since it is larger than the sum of its proper divisors (43115111).

209070145 is a wasteful number, since it uses less digits than its factorization.

209070145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216851.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 209070145 is about 14459.2581068325. The cubic root of 209070145 is about 593.5135979294.

The spelling of 209070145 in words is "two hundred nine million, seventy thousand, one hundred forty-five".