212799989 has 2 divisors, whose sum is σ = 212799990. Its totient is φ = 212799988.

The previous prime is 212799971. The next prime is 212800001. The reversal of 212799989 is 989997212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170093764 + 42706225 = 13042^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 212799989 - 2¹² = 212795893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212799919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106399994 + 106399995.

It is an arithmetic number, because the mean of its divisors is an integer number (106399995).

Almost surely, 2^212799989 is an apocalyptic number.

It is an amenable number.

212799989 is a deficient number, since it is larger than the sum of its proper divisors (1).

212799989 is an equidigital number, since it uses as much as digits as its factorization.

212799989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 56.

The square root of 212799989 is about 14587.6656460175. The cubic root of 212799989 is about 597.0222732044.

The spelling of 212799989 in words is "two hundred twelve million, seven hundred ninety-nine thousand, nine hundred eighty-nine".