209212513 has 2 divisors, whose sum is σ = 209212514. Its totient is φ = 209212512.

The previous prime is 209212483. The next prime is 209212517. The reversal of 209212513 is 315212902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130233744 + 78978769 = 11412^2 + 8887^2 .

It is a cyclic number.

It is not a de Polignac number, because 209212513 - 2¹³ = 209204321 is a prime.

It is not a weakly prime, because it can be changed into another prime (209212517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104606256 + 104606257.

It is an arithmetic number, because the mean of its divisors is an integer number (104606257).

Almost surely, 2^209212513 is an apocalyptic number.

It is an amenable number.

209212513 is a deficient number, since it is larger than the sum of its proper divisors (1).

209212513 is an equidigital number, since it uses as much as digits as its factorization.

209212513 is an evil number, because the sum of its binary digits is even.

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

The square root of 209212513 is about 14464.1803431788. The cubic root of 209212513 is about 593.6482866507.

The spelling of 209212513 in words is "two hundred nine million, two hundred twelve thousand, five hundred thirteen".