1212701209 has 4 divisors (see below), whose sum is σ = 1213788004. Its totient is φ = 1211614416.

The previous prime is 1212701173. The next prime is 1212701219. The reversal of 1212701209 is 9021072121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9021072121 = 23 ⋅392220527.

It can be written as a sum of positive squares in 2 ways, for example, as 256160025 + 956541184 = 16005^2 + 30928^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212701209 - 2²⁵ = 1179146777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212701219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541722 + ... + 543955.

It is an arithmetic number, because the mean of its divisors is an integer number (303447001).

Almost surely, 2^1212701209 is an apocalyptic number.

It is an amenable number.

1212701209 is a deficient number, since it is larger than the sum of its proper divisors (1086795).

1212701209 is a wasteful number, since it uses less digits than its factorization.

1212701209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086794.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 1212701209 is about 34823.8597659708. The cubic root of 1212701209 is about 1066.3945990467.

The spelling of 1212701209 in words is "one billion, two hundred twelve million, seven hundred one thousand, two hundred nine".