206426249 has 2 divisors, whose sum is σ = 206426250. Its totient is φ = 206426248.

The previous prime is 206426243. The next prime is 206426287. The reversal of 206426249 is 942624602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149695225 + 56731024 = 12235^2 + 7532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206426249 is a prime.

It is a super-2 number, since 2×206426249² = 85223592552420002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206426243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103213124 + 103213125.

It is an arithmetic number, because the mean of its divisors is an integer number (103213125).

Almost surely, 2^206426249 is an apocalyptic number.

It is an amenable number.

206426249 is a deficient number, since it is larger than the sum of its proper divisors (1).

206426249 is an equidigital number, since it uses as much as digits as its factorization.

206426249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 206426249 is about 14367.5415085532. The cubic root of 206426249 is about 591.0011242121.

The spelling of 206426249 in words is "two hundred six million, four hundred twenty-six thousand, two hundred forty-nine".