209474149 has 2 divisors, whose sum is σ = 209474150. Its totient is φ = 209474148.

The previous prime is 209474147. The next prime is 209474191. The reversal of 209474149 is 941474902.

209474149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187553025 + 21921124 = 13695^2 + 4682^2 .

It is a cyclic number.

It is not a de Polignac number, because 209474149 - 2¹ = 209474147 is a prime.

Together with 209474147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209474141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104737074 + 104737075.

It is an arithmetic number, because the mean of its divisors is an integer number (104737075).

Almost surely, 2^209474149 is an apocalyptic number.

It is an amenable number.

209474149 is a deficient number, since it is larger than the sum of its proper divisors (1).

209474149 is an equidigital number, since it uses as much as digits as its factorization.

209474149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 209474149 is about 14473.2217906035. The cubic root of 209474149 is about 593.8956508571.

The spelling of 209474149 in words is "two hundred nine million, four hundred seventy-four thousand, one hundred forty-nine".