200906521 has 2 divisors, whose sum is σ = 200906522. Its totient is φ = 200906520.

The previous prime is 200906501. The next prime is 200906533. The reversal of 200906521 is 125609002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169937296 + 30969225 = 13036^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 200906521 - 2¹³ = 200898329 is a prime.

It is not a weakly prime, because it can be changed into another prime (200906501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100453260 + 100453261.

It is an arithmetic number, because the mean of its divisors is an integer number (100453261).

Almost surely, 2^200906521 is an apocalyptic number.

It is an amenable number.

200906521 is a deficient number, since it is larger than the sum of its proper divisors (1).

200906521 is an equidigital number, since it uses as much as digits as its factorization.

200906521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 200906521 is about 14174.1497452228. The cubic root of 200906521 is about 585.6857772108.

The spelling of 200906521 in words is "two hundred million, nine hundred six thousand, five hundred twenty-one".