1201234009 has 2 divisors, whose sum is σ = 1201234010. Its totient is φ = 1201234008.

The previous prime is 1201234007. The next prime is 1201234039. The reversal of 1201234009 is 9004321021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907214400 + 294019609 = 30120^2 + 17147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201234009 - 2¹ = 1201234007 is a prime.

Together with 1201234007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1201234003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600617004 + 600617005.

It is an arithmetic number, because the mean of its divisors is an integer number (600617005).

Almost surely, 2^1201234009 is an apocalyptic number.

It is an amenable number.

1201234009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201234009 is an equidigital number, since it uses as much as digits as its factorization.

1201234009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1201234009 is about 34658.8229603949. The cubic root of 1201234009 is about 1063.0227027928.

The spelling of 1201234009 in words is "one billion, two hundred one million, two hundred thirty-four thousand, nine".