1200011001 has 32 divisors (see below), whose sum is σ = 1908603648. Its totient is φ = 656348160.

The previous prime is 1200010963. The next prime is 1200011009. The reversal of 1200011001 is 1001100021.

It is not a de Polignac number, because 1200011001 - 2⁹ = 1200010489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200011009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32485 + ... + 58781.

It is an arithmetic number, because the mean of its divisors is an integer number (59643864).

Almost surely, 2^1200011001 is an apocalyptic number.

It is an amenable number.

1200011001 is a deficient number, since it is larger than the sum of its proper divisors (708592647).

1200011001 is a wasteful number, since it uses less digits than its factorization.

1200011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26401.

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

The square root of 1200011001 is about 34641.1749367714. The cubic root of 1200011001 is about 1062.6618164802.

Adding to 1200011001 its reverse (1001100021), we get a palindrome (2201111022).

The spelling of 1200011001 in words is "one billion, two hundred million, eleven thousand, one".