211138749 has 6 divisors (see below), whose sum is σ = 304978206. Its totient is φ = 140759160.

The previous prime is 211138747. The next prime is 211138769. The reversal of 211138749 is 947831112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 208224900 + 2913849 = 14430^2 + 1707^2 .

It is not a de Polignac number, because 211138749 - 2¹ = 211138747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211138747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11729922 + ... + 11729939.

It is an arithmetic number, because the mean of its divisors is an integer number (50829701).

Almost surely, 2^211138749 is an apocalyptic number.

It is an amenable number.

211138749 is a deficient number, since it is larger than the sum of its proper divisors (93839457).

211138749 is a wasteful number, since it uses less digits than its factorization.

211138749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23459867 (or 23459864 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 211138749 is about 14530.6141989938. The cubic root of 211138749 is about 595.4646456475.

The spelling of 211138749 in words is "two hundred eleven million, one hundred thirty-eight thousand, seven hundred forty-nine".