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211138231 is a prime number
BaseRepresentation
bin11001001010110…
…11011010110111
3112201021221012111
430211123122313
5413022410411
632541231451
75142434233
oct1445333267
9481257174
10211138231
11a9200307
125a862587
1334986c85
14200815c3
1513809721
hexc95b6b7

211138231 has 2 divisors, whose sum is σ = 211138232. Its totient is φ = 211138230.

The previous prime is 211138201. The next prime is 211138253. The reversal of 211138231 is 132831112.

It is a happy number.

It is an a-pointer prime, because the next prime (211138253) can be obtained adding 211138231 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211138231 - 25 = 211138199 is a prime.

It is a super-2 number, since 2×2111382312 = 89158705179618722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211138201) 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, 105569115 + 105569116.

It is an arithmetic number, because the mean of its divisors is an integer number (105569116).

Almost surely, 2211138231 is an apocalyptic number.

211138231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211138231 is an equidigital number, since it uses as much as digits as its factorization.

211138231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 211138231 is about 14530.5963745471. The cubic root of 211138231 is about 595.4641586835.

Adding to 211138231 its reverse (132831112), we get a palindrome (343969343).

The spelling of 211138231 in words is "two hundred eleven million, one hundred thirty-eight thousand, two hundred thirty-one".