212928997 has 2 divisors, whose sum is σ = 212928998. Its totient is φ = 212928996.

The previous prime is 212928977. The next prime is 212929001. The reversal of 212928997 is 799829212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184987201 + 27941796 = 13601^2 + 5286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212928997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212928997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212928977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106464498 + 106464499.

It is an arithmetic number, because the mean of its divisors is an integer number (106464499).

Almost surely, 2^212928997 is an apocalyptic number.

It is an amenable number.

212928997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212928997 is an equidigital number, since it uses as much as digits as its factorization.

212928997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 212928997 is about 14592.0867938756. The cubic root of 212928997 is about 597.1428952192.

The spelling of 212928997 in words is "two hundred twelve million, nine hundred twenty-eight thousand, nine hundred ninety-seven".