211742129 has 2 divisors, whose sum is σ = 211742130. Its totient is φ = 211742128.

The previous prime is 211742119. The next prime is 211742189. The reversal of 211742129 is 921247112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178275904 + 33466225 = 13352^2 + 5785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211742129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211742119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105871064 + 105871065.

It is an arithmetic number, because the mean of its divisors is an integer number (105871065).

Almost surely, 2^211742129 is an apocalyptic number.

It is an amenable number.

211742129 is a deficient number, since it is larger than the sum of its proper divisors (1).

211742129 is an equidigital number, since it uses as much as digits as its factorization.

211742129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 211742129 is about 14551.3617575813. The cubic root of 211742129 is about 596.0313342158.

The spelling of 211742129 in words is "two hundred eleven million, seven hundred forty-two thousand, one hundred twenty-nine".