1201006155 has 16 divisors (see below), whose sum is σ = 1950292224. Its totient is φ = 630975840.

The previous prime is 1201006141. The next prime is 1201006159. The reversal of 1201006155 is 5516001021.

It is not a de Polignac number, because 1201006155 - 2⁶ = 1201006091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201006159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596511 + ... + 598520.

It is an arithmetic number, because the mean of its divisors is an integer number (121893264).

Almost surely, 2^1201006155 is an apocalyptic number.

1201006155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1201006155 is a deficient number, since it is larger than the sum of its proper divisors (749286069).

1201006155 is a wasteful number, since it uses less digits than its factorization.

1201006155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195106.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1201006155 is about 34655.5357049924. The cubic root of 1201006155 is about 1062.9554860004.

Adding to 1201006155 its reverse (5516001021), we get a palindrome (6717007176).

The spelling of 1201006155 in words is "one billion, two hundred one million, six thousand, one hundred fifty-five".