213111149 has 2 divisors, whose sum is σ = 213111150. Its totient is φ = 213111148.

The previous prime is 213111131. The next prime is 213111161. The reversal of 213111149 is 941111312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212868100 + 243049 = 14590^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 213111149 - 2²⁴ = 196333933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213111449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555574 + 106555575.

It is an arithmetic number, because the mean of its divisors is an integer number (106555575).

Almost surely, 2^213111149 is an apocalyptic number.

It is an amenable number.

213111149 is a deficient number, since it is larger than the sum of its proper divisors (1).

213111149 is an equidigital number, since it uses as much as digits as its factorization.

213111149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 213111149 is about 14598.3269246856. The cubic root of 213111149 is about 597.3131237502.

The spelling of 213111149 in words is "two hundred thirteen million, one hundred eleven thousand, one hundred forty-nine".