211112609 has 2 divisors, whose sum is σ = 211112610. Its totient is φ = 211112608.

The previous prime is 211112599. The next prime is 211112633. The reversal of 211112609 is 906211112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206554384 + 4558225 = 14372^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112609 - 2⁴ = 211112593 is a prime.

It is not a weakly prime, because it can be changed into another prime (211112689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105556304 + 105556305.

It is an arithmetic number, because the mean of its divisors is an integer number (105556305).

Almost surely, 2^211112609 is an apocalyptic number.

It is an amenable number.

211112609 is a deficient number, since it is larger than the sum of its proper divisors (1).

211112609 is an equidigital number, since it uses as much as digits as its factorization.

211112609 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 23.

The square root of 211112609 is about 14529.7146909360. The cubic root of 211112609 is about 595.4400708307.

The spelling of 211112609 in words is "two hundred eleven million, one hundred twelve thousand, six hundred nine".