1201222001 has 4 divisors (see below), whose sum is σ = 1372825152. Its totient is φ = 1029618852.

The previous prime is 1201221961. The next prime is 1201222027. The reversal of 1201222001 is 1002221021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201222001 - 2⁶ = 1201221937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201222031) 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, 85801565 + ... + 85801578.

It is an arithmetic number, because the mean of its divisors is an integer number (343206288).

Almost surely, 2^1201222001 is an apocalyptic number.

It is an amenable number.

1201222001 is a deficient number, since it is larger than the sum of its proper divisors (171603151).

1201222001 is an equidigital number, since it uses as much as digits as its factorization.

1201222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171603150.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1201222001 is about 34658.6497284588. The cubic root of 1201222001 is about 1063.0191606523.

Adding to 1201222001 its reverse (1002221021), we get a palindrome (2203443022).

The spelling of 1201222001 in words is "one billion, two hundred one million, two hundred twenty-two thousand, one".