1200101001 has 16 divisors (see below), whose sum is σ = 1770190848. Its totient is φ = 717088400.

The previous prime is 1200100999. The next prime is 1200101011. The reversal of 1200101001 is 1001010021.

It is a cyclic number.

It is not a de Polignac number, because 1200101001 - 2¹ = 1200100999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200101011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253761 + ... + 258446.

It is an arithmetic number, because the mean of its divisors is an integer number (110636928).

Almost surely, 2^1200101001 is an apocalyptic number.

1200101001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200101001 is a deficient number, since it is larger than the sum of its proper divisors (570089847).

1200101001 is a wasteful number, since it uses less digits than its factorization.

1200101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512292.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1200101001 is about 34642.4739445669. The cubic root of 1200101001 is about 1062.6883821179.

Adding to 1200101001 its reverse (1001010021), we get a palindrome (2201111022).

It can be divided in two parts, 1200 and 101001, that added together give a palindrome (102201).

The spelling of 1200101001 in words is "one billion, two hundred million, one hundred one thousand, one".