206249957 has 2 divisors, whose sum is σ = 206249958. Its totient is φ = 206249956.

The previous prime is 206249929. The next prime is 206249987. The reversal of 206249957 is 759942602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187854436 + 18395521 = 13706^2 + 4289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206249957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206249917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103124978 + 103124979.

It is an arithmetic number, because the mean of its divisors is an integer number (103124979).

Almost surely, 2^206249957 is an apocalyptic number.

It is an amenable number.

206249957 is a deficient number, since it is larger than the sum of its proper divisors (1).

206249957 is an equidigital number, since it uses as much as digits as its factorization.

206249957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 206249957 is about 14361.4051192772. The cubic root of 206249957 is about 590.8328341738.

The spelling of 206249957 in words is "two hundred six million, two hundred forty-nine thousand, nine hundred fifty-seven".