209147933 has 4 divisors (see below), whose sum is σ = 209293920. Its totient is φ = 209001948.

The previous prime is 209147927. The next prime is 209147959. The reversal of 209147933 is 339741902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209147933 - 2⁸ = 209147677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209147033) 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, 70823 + ... + 73716.

It is an arithmetic number, because the mean of its divisors is an integer number (52323480).

Almost surely, 2^209147933 is an apocalyptic number.

It is an amenable number.

209147933 is a deficient number, since it is larger than the sum of its proper divisors (145987).

209147933 is a wasteful number, since it uses less digits than its factorization.

209147933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145986.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 209147933 is about 14461.9477595516. The cubic root of 209147933 is about 593.5871976473.

The spelling of 209147933 in words is "two hundred nine million, one hundred forty-seven thousand, nine hundred thirty-three".