1201201001 has 72 divisors (see below), whose sum is σ = 1691887680. Its totient is φ = 829604160.

The previous prime is 1201200947. The next prime is 1201201003. The reversal of 1201201001 is 1001021021.

It is not a de Polignac number, because 1201201001 - 2⁶ = 1201200937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201201001.

It is not an unprimeable number, because it can be changed into a prime (1201201003) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 20359310 + ... + 20359368.

It is an arithmetic number, because the mean of its divisors is an integer number (23498440).

Almost surely, 2^1201201001 is an apocalyptic number.

1201201001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201201001 is a deficient number, since it is larger than the sum of its proper divisors (490686679).

1201201001 is a wasteful number, since it uses less digits than its factorization.

1201201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1201201001 is about 34658.3467724587. The cubic root of 1201201001 is about 1063.0129659793.

Adding to 1201201001 its reverse (1001021021), we get a palindrome (2202222022).

It can be divided in two parts, 120120 and 1001, that added together give a palindrome (121121).

The spelling of 1201201001 in words is "one billion, two hundred one million, two hundred one thousand, one".