209420249 has 2 divisors, whose sum is σ = 209420250. Its totient is φ = 209420248.

The previous prime is 209420219. The next prime is 209420257. The reversal of 209420249 is 942024902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110775625 + 98644624 = 10525^2 + 9932^2 .

It is a cyclic number.

It is not a de Polignac number, because 209420249 - 2¹² = 209416153 is a prime.

It is not a weakly prime, because it can be changed into another prime (209420219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104710124 + 104710125.

It is an arithmetic number, because the mean of its divisors is an integer number (104710125).

Almost surely, 2^209420249 is an apocalyptic number.

It is an amenable number.

209420249 is a deficient number, since it is larger than the sum of its proper divisors (1).

209420249 is an equidigital number, since it uses as much as digits as its factorization.

209420249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 209420249 is about 14471.3596113150. The cubic root of 209420249 is about 593.8447078621.

The spelling of 209420249 in words is "two hundred nine million, four hundred twenty thousand, two hundred forty-nine".