209031013 has 2 divisors, whose sum is σ = 209031014. Its totient is φ = 209031012.

The previous prime is 209031001. The next prime is 209031049. The reversal of 209031013 is 310130902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149401729 + 59629284 = 12223^2 + 7722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209031013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209034013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104515506 + 104515507.

It is an arithmetic number, because the mean of its divisors is an integer number (104515507).

Almost surely, 2^209031013 is an apocalyptic number.

It is an amenable number.

209031013 is a deficient number, since it is larger than the sum of its proper divisors (1).

209031013 is an equidigital number, since it uses as much as digits as its factorization.

209031013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 209031013 is about 14457.9048620469. The cubic root of 209031013 is about 593.4765659829.

Adding to 209031013 its reverse (310130902), we get a palindrome (519161915).

The spelling of 209031013 in words is "two hundred nine million, thirty-one thousand, thirteen".