67211231 has 2 divisors, whose sum is σ = 67211232. Its totient is φ = 67211230.

The previous prime is 67211219. The next prime is 67211233. The reversal of 67211231 is 13211276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67211231 - 2¹⁸ = 66949087 is a prime.

It is a super-2 number, since 2×67211231² = 9034699145070722, which contains 22 as substring.

Together with 67211233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67211197 and 67211206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67211233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33605615 + 33605616.

It is an arithmetic number, because the mean of its divisors is an integer number (33605616).

Almost surely, 2^67211231 is an apocalyptic number.

67211231 is a deficient number, since it is larger than the sum of its proper divisors (1).

67211231 is an equidigital number, since it uses as much as digits as its factorization.

67211231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 67211231 is about 8198.2456050060. The cubic root of 67211231 is about 406.5811905664.

The spelling of 67211231 in words is "sixty-seven million, two hundred eleven thousand, two hundred thirty-one".