1201001011 has 16 divisors (see below), whose sum is σ = 1404887040. Its totient is φ = 1005291360.

The previous prime is 1201001003. The next prime is 1201001017. The reversal of 1201001011 is 1101001021.

It is a cyclic number.

It is not a de Polignac number, because 1201001011 - 2³ = 1201001003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201000985 and 1201001003.

It is not an unprimeable number, because it can be changed into a prime (1201001017) 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, 153781 + ... + 161401.

It is an arithmetic number, because the mean of its divisors is an integer number (87805440).

Almost surely, 2^1201001011 is an apocalyptic number.

1201001011 is a deficient number, since it is larger than the sum of its proper divisors (203886029).

1201001011 is an equidigital number, since it uses as much as digits as its factorization.

1201001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1201001011 is about 34655.4614887755. The cubic root of 1201001011 is about 1062.9539684254.

Adding to 1201001011 its reverse (1101001021), we get a palindrome (2302002032).

The spelling of 1201001011 in words is "one billion, two hundred one million, one thousand, eleven".