209719045 has 16 divisors (see below), whose sum is σ = 256197888. Its totient is φ = 164767680.

The previous prime is 209719043. The next prime is 209719049. The reversal of 209719045 is 540917902.

It is not a de Polignac number, because 209719045 - 2¹ = 209719043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209718995 and 209719013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209719043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140292 + ... + 141778.

It is an arithmetic number, because the mean of its divisors is an integer number (16012368).

Almost surely, 2^209719045 is an apocalyptic number.

It is an amenable number.

209719045 is a deficient number, since it is larger than the sum of its proper divisors (46478843).

209719045 is a wasteful number, since it uses less digits than its factorization.

209719045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 209719045 is about 14481.6796332470. The cubic root of 209719045 is about 594.1270016432.

The spelling of 209719045 in words is "two hundred nine million, seven hundred nineteen thousand, forty-five".