1210122009 has 6 divisors (see below), whose sum is σ = 1747954026. Its totient is φ = 806748000.

The previous prime is 1210122007. The next prime is 1210122029. The reversal of 1210122009 is 9002210121.

It can be written as a sum of positive squares in only one way, i.e., 1154096784 + 56025225 = 33972^2 + 7485^2 .

It is not a de Polignac number, because 1210122009 - 2¹ = 1210122007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210121982 and 1210122000.

It is not an unprimeable number, because it can be changed into a prime (1210122007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67228992 + ... + 67229009.

It is an arithmetic number, because the mean of its divisors is an integer number (291325671).

Almost surely, 2^1210122009 is an apocalyptic number.

It is an amenable number.

1210122009 is a deficient number, since it is larger than the sum of its proper divisors (537832017).

1210122009 is a wasteful number, since it uses less digits than its factorization.

1210122009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134458007 (or 134458004 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1210122009 is about 34786.8079737133. The cubic root of 1210122009 is about 1065.6380518337.

The spelling of 1210122009 in words is "one billion, two hundred ten million, one hundred twenty-two thousand, nine".