1201022001 has 12 divisors (see below), whose sum is σ = 1836857412. Its totient is φ = 753582336.

The previous prime is 1201021963. The next prime is 1201022041. The reversal of 1201022001 is 1002201021.

It can be written as a sum of positive squares in 2 ways, for example, as 1035230625 + 165791376 = 32175^2 + 12876^2 .

It is not a de Polignac number, because 1201022001 - 2⁶ = 1201021937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1201022041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3924756 + ... + 3925061.

It is an arithmetic number, because the mean of its divisors is an integer number (153071451).

Almost surely, 2^1201022001 is an apocalyptic number.

It is an amenable number.

1201022001 is a deficient number, since it is larger than the sum of its proper divisors (635835411).

1201022001 is a wasteful number, since it uses less digits than its factorization.

1201022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7849840 (or 7849837 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1201022001 is about 34655.7643257222. The cubic root of 1201022001 is about 1062.9601608359.

Adding to 1201022001 its reverse (1002201021), we get a palindrome (2203223022).

It can be divided in two parts, 120 and 1022001, that added together give a square (1022121 = 1011²).

The spelling of 1201022001 in words is "one billion, two hundred one million, twenty-two thousand, one".