212267749 has 2 divisors, whose sum is σ = 212267750. Its totient is φ = 212267748.

The previous prime is 212267747. The next prime is 212267767. The reversal of 212267749 is 947762212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207878724 + 4389025 = 14418^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 212267749 - 2¹ = 212267747 is a prime.

Together with 212267747, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212267743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106133874 + 106133875.

It is an arithmetic number, because the mean of its divisors is an integer number (106133875).

Almost surely, 2^212267749 is an apocalyptic number.

It is an amenable number.

212267749 is a deficient number, since it is larger than the sum of its proper divisors (1).

212267749 is an equidigital number, since it uses as much as digits as its factorization.

212267749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 212267749 is about 14569.4114157024. The cubic root of 212267749 is about 596.5241146226.

The spelling of 212267749 in words is "two hundred twelve million, two hundred sixty-seven thousand, seven hundred forty-nine".