212699989 has 4 divisors (see below), whose sum is σ = 214054924. Its totient is φ = 211345056.

The previous prime is 212699983. The next prime is 212700011. The reversal of 212699989 is 989996212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64883025 + 147816964 = 8055^2 + 12158^2 .

It is a cyclic number.

It is not a de Polignac number, because 212699989 - 2¹⁹ = 212175701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212699983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677232 + ... + 677545.

It is an arithmetic number, because the mean of its divisors is an integer number (53513731).

Almost surely, 2^212699989 is an apocalyptic number.

It is an amenable number.

212699989 is a deficient number, since it is larger than the sum of its proper divisors (1354935).

212699989 is a wasteful number, since it uses less digits than its factorization.

212699989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354934.

The product of its digits is 1259712, while the sum is 55.

The square root of 212699989 is about 14584.2376900543. The cubic root of 212699989 is about 596.9287400203.

The spelling of 212699989 in words is "two hundred twelve million, six hundred ninety-nine thousand, nine hundred eighty-nine".