213040109 has 2 divisors, whose sum is σ = 213040110. Its totient is φ = 213040108.

The previous prime is 213040097. The next prime is 213040111. The reversal of 213040109 is 901040312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158206084 + 54834025 = 12578^2 + 7405^2 .

It is a cyclic number.

It is not a de Polignac number, because 213040109 - 2¹² = 213036013 is a prime.

Together with 213040111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213040309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106520054 + 106520055.

It is an arithmetic number, because the mean of its divisors is an integer number (106520055).

Almost surely, 2^213040109 is an apocalyptic number.

It is an amenable number.

213040109 is a deficient number, since it is larger than the sum of its proper divisors (1).

213040109 is an equidigital number, since it uses as much as digits as its factorization.

213040109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 213040109 is about 14595.8935663426. The cubic root of 213040109 is about 597.2467454927.

The spelling of 213040109 in words is "two hundred thirteen million, forty thousand, one hundred nine".