206389453 has 2 divisors, whose sum is σ = 206389454. Its totient is φ = 206389452.

The previous prime is 206389409. The next prime is 206389483. The reversal of 206389453 is 354983602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184878409 + 21511044 = 13597^2 + 4638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206389453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206389483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103194726 + 103194727.

It is an arithmetic number, because the mean of its divisors is an integer number (103194727).

Almost surely, 2^206389453 is an apocalyptic number.

It is an amenable number.

206389453 is a deficient number, since it is larger than the sum of its proper divisors (1).

206389453 is an equidigital number, since it uses as much as digits as its factorization.

206389453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 206389453 is about 14366.2609262118. The cubic root of 206389453 is about 590.9660063113.

The spelling of 206389453 in words is "two hundred six million, three hundred eighty-nine thousand, four hundred fifty-three".