211649693 has 2 divisors, whose sum is σ = 211649694. Its totient is φ = 211649692.

The previous prime is 211649689. The next prime is 211649701. The reversal of 211649693 is 396946112.

211649693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154828249 + 56821444 = 12443^2 + 7538^2 .

It is a cyclic number.

It is not a de Polignac number, because 211649693 - 2² = 211649689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211649693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211649623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105824846 + 105824847.

It is an arithmetic number, because the mean of its divisors is an integer number (105824847).

Almost surely, 2^211649693 is an apocalyptic number.

It is an amenable number.

211649693 is a deficient number, since it is larger than the sum of its proper divisors (1).

211649693 is an equidigital number, since it uses as much as digits as its factorization.

211649693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 211649693 is about 14548.1852132835. The cubic root of 211649693 is about 595.9445891236.

The spelling of 211649693 in words is "two hundred eleven million, six hundred forty-nine thousand, six hundred ninety-three".