213508911949 has 2 divisors, whose sum is σ = 213508911950. Its totient is φ = 213508911948.

The previous prime is 213508911947. The next prime is 213508912003. The reversal of 213508911949 is 949119805312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109369104100 + 104139807849 = 330710^2 + 322707^2 .

It is a cyclic number.

It is not a de Polignac number, because 213508911949 - 2¹ = 213508911947 is a prime.

Together with 213508911947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213508911896 and 213508911905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213508911947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106754455974 + 106754455975.

It is an arithmetic number, because the mean of its divisors is an integer number (106754455975).

Almost surely, 2^213508911949 is an apocalyptic number.

It is an amenable number.

213508911949 is a deficient number, since it is larger than the sum of its proper divisors (1).

213508911949 is an equidigital number, since it uses as much as digits as its factorization.

213508911949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The spelling of 213508911949 in words is "two hundred thirteen billion, five hundred eight million, nine hundred eleven thousand, nine hundred forty-nine".