211138937 has 6 divisors (see below), whose sum is σ = 218671518. Its totient is φ = 203857472.

The previous prime is 211138933. The next prime is 211138973. The reversal of 211138937 is 739831112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 80928016 + 130210921 = 8996^2 + 11411^2 .

It is not a de Polignac number, because 211138937 - 2² = 211138933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211138897 and 211138906.

It is not an unprimeable number, because it can be changed into a prime (211138933) 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, 124688 + ... + 126369.

It is an arithmetic number, because the mean of its divisors is an integer number (36445253).

Almost surely, 2^211138937 is an apocalyptic number.

It is an amenable number.

211138937 is a deficient number, since it is larger than the sum of its proper divisors (7532581).

211138937 is an equidigital number, since it uses as much as digits as its factorization.

211138937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251115 (or 251086 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 211138937 is about 14530.6206680926. The cubic root of 211138937 is about 595.4648223833.

It can be divided in two parts, 21113 and 8937, that multiplied together give a palindrome (188686881).

The spelling of 211138937 in words is "two hundred eleven million, one hundred thirty-eight thousand, nine hundred thirty-seven".