209641513 has 2 divisors, whose sum is σ = 209641514. Its totient is φ = 209641512.

The previous prime is 209641507. The next prime is 209641583. The reversal of 209641513 is 315146902.

209641513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208744704 + 896809 = 14448^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 209641513 - 2¹³ = 209633321 is a prime.

It is not a weakly prime, because it can be changed into another prime (209641583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104820756 + 104820757.

It is an arithmetic number, because the mean of its divisors is an integer number (104820757).

Almost surely, 2^209641513 is an apocalyptic number.

It is an amenable number.

209641513 is a deficient number, since it is larger than the sum of its proper divisors (1).

209641513 is an equidigital number, since it uses as much as digits as its factorization.

209641513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 209641513 is about 14479.0024863593. The cubic root of 209641513 is about 594.0537774360.

The spelling of 209641513 in words is "two hundred nine million, six hundred forty-one thousand, five hundred thirteen".