212755639 has 2 divisors, whose sum is σ = 212755640. Its totient is φ = 212755638.

The previous prime is 212755637. The next prime is 212755679. The reversal of 212755639 is 936557212.

It is an a-pointer prime, because the next prime (212755679) can be obtained adding 212755639 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212755639 - 2¹ = 212755637 is a prime.

Together with 212755637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212755637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106377819 + 106377820.

It is an arithmetic number, because the mean of its divisors is an integer number (106377820).

Almost surely, 2^212755639 is an apocalyptic number.

212755639 is a deficient number, since it is larger than the sum of its proper divisors (1).

212755639 is an equidigital number, since it uses as much as digits as its factorization.

212755639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 212755639 is about 14586.1454469644. The cubic root of 212755639 is about 596.9807948541.

The spelling of 212755639 in words is "two hundred twelve million, seven hundred fifty-five thousand, six hundred thirty-nine".